39897172512 has 96 divisors (see below), whose sum is σ = 116409303360. Its totient is φ = 13294195200.

The previous prime is 39897172489. The next prime is 39897172531. The reversal of 39897172512 is 21527179893.

It is a happy number.

39897172512 is a `hidden beast` number, since 39 + 8 + 97 + 1 + 7 + 2 + 512 = 666.

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 (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2959387 + ... + 2972837.

It is an arithmetic number, because the mean of its divisors is an integer number (1212596910).

Almost surely, 2^39897172512 is an apocalyptic number.

39897172512 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

39897172512 is an abundant number, since it is smaller than the sum of its proper divisors (76512130848).

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

39897172512 is a wasteful number, since it uses less digits than its factorization.

39897172512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16903 (or 16889 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 39897172512 in words is "thirty-nine billion, eight hundred ninety-seven million, one hundred seventy-two thousand, five hundred twelve".