2139971808 has 96 divisors (see below), whose sum is σ = 6134994432. Its totient is φ = 649152000.

The previous prime is 2139971807. The next prime is 2139971833. The reversal of 2139971808 is 8081799312.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139971807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76533 + ... + 100683.

It is an arithmetic number, because the mean of its divisors is an integer number (63906192).

Almost surely, 2^2139971808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2139971808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3067497216).

2139971808 is an abundant number, since it is smaller than the sum of its proper divisors (3995022624).

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

2139971808 is a wasteful number, since it uses less digits than its factorization.

2139971808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24248 (or 24240 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 2139971808 is about 46259.8293122662. The cubic root of 2139971808 is about 1288.6530836594.

The spelling of 2139971808 in words is "two billion, one hundred thirty-nine million, nine hundred seventy-one thousand, eight hundred eight".