39697856 has 112 divisors (see below), whose sum is σ = 94804992. Its totient is φ = 16281600.

The previous prime is 39697849. The next prime is 39697871. The reversal of 39697856 is 65879693.

Its product of digits (2449440) is a multiple of the sum of its prime divisors (168).

It is a junction number, because it is equal to n+sod(n) for n = 39697798 and 39697807.

It is a congruent number.

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, 370955 + ... + 371061.

Almost surely, 2^39697856 is an apocalyptic number.

39697856 is the 3638-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39697856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47402496).

39697856 is an abundant number, since it is smaller than the sum of its proper divisors (55107136).

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

39697856 is a wasteful number, since it uses less digits than its factorization.

39697856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 168 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 53.

The square root of 39697856 is about 6300.6234612140. The cubic root of 39697856 is about 341.1319137728.

The spelling of 39697856 in words is "thirty-nine million, six hundred ninety-seven thousand, eight hundred fifty-six".