396839172240 has 800 divisors, whose sum is σ = 1692949572864. Its totient is φ = 84085309440.

The previous prime is 396839172227. The next prime is 396839172253. The reversal of 396839172240 is 42271938693.

396839172240 is a `hidden beast` number, since 3 + 9 + 6 + 8 + 391 + 7 + 2 + 240 = 666.

It is an interprime number because it is at equal distance from previous prime (396839172227) and next prime (396839172253).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 51661200 + ... + 51668880.

Almost surely, 2^396839172240 is an apocalyptic number.

396839172240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 396839172240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846474786432).

396839172240 is an abundant number, since it is smaller than the sum of its proper divisors (1296110400624).

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

396839172240 is a wasteful number, since it uses less digits than its factorization.

396839172240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7797 (or 7782 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 396839172240 in words is "three hundred ninety-six billion, eight hundred thirty-nine million, one hundred seventy-two thousand, two hundred forty".