39691968 has 56 divisors (see below), whose sum is σ = 106771440. Its totient is φ = 13009920.

The previous prime is 39691963. The next prime is 39691973. The reversal of 39691968 is 86919693.

It is an interprime number because it is at equal distance from previous prime (39691963) and next prime (39691973).

It is a self number, because there is not a number n which added to its sum of digits gives 39691968.

It is not an unprimeable number, because it can be changed into a prime (39691963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10018 + ... + 13406.

Almost surely, 2^39691968 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 39691968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53385720).

39691968 is an abundant number, since it is smaller than the sum of its proper divisors (67079472).

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

39691968 is a wasteful number, since it uses less digits than its factorization.

39691968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465 (or 3455 counting only the distinct ones).

The product of its digits is 629856, while the sum is 51.

The square root of 39691968 is about 6300.1561885401. The cubic root of 39691968 is about 341.1150473369.

The spelling of 39691968 in words is "thirty-nine million, six hundred ninety-one thousand, nine hundred sixty-eight".