1639249950 has 96 divisors (see below), whose sum is σ = 4450152672. Its totient is φ = 396864000.

The previous prime is 1639249949. The next prime is 1639250021. The reversal of 1639249950 is 599429361.

1639249950 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1639249950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112060 + ... + 125840.

It is an arithmetic number, because the mean of its divisors is an integer number (46355757).

Almost surely, 2^1639249950 is an apocalyptic number.

1639249950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1639249950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2225076336).

1639249950 is an abundant number, since it is smaller than the sum of its proper divisors (2810902722).

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

1639249950 is a wasteful number, since it uses less digits than its factorization.

1639249950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13870 (or 13865 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 48.

The square root of 1639249950 is about 40487.6518212652. The cubic root of 1639249950 is about 1179.0939012619.

The spelling of 1639249950 in words is "one billion, six hundred thirty-nine million, two hundred forty-nine thousand, nine hundred fifty".