2139487650 has 72 divisors (see below), whose sum is σ = 5826920580. Its totient is φ = 562705920.

The previous prime is 2139487639. The next prime is 2139487657. The reversal of 2139487650 is 567849312.

2139487650 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 375235641 + 1764252009 = 19371^2 + 42003^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

2139487650 is strictly pandigital in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 2139487596 and 2139487605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139487657) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 286 + ... + 65414.

It is a 1-persistent number, because it is pandigital, but 2⋅2139487650 = 4278975300 is not.

Almost surely, 2^2139487650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2139487650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2913460290).

2139487650 is an abundant number, since it is smaller than the sum of its proper divisors (3687432930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2139487650 is a wasteful number, since it uses less digits than its factorization.

2139487650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65220 (or 65212 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 2139487650 is about 46254.5959878583. The cubic root of 2139487650 is about 1288.5558925414. Note that the first 3 decimals are identical.

The spelling of 2139487650 in words is "two billion, one hundred thirty-nine million, four hundred eighty-seven thousand, six hundred fifty".