39691969 has 4 divisors (see below), whose sum is σ = 41781040. Its totient is φ = 37602900.

The previous prime is 39691963. The next prime is 39691973. The reversal of 39691969 is 96919693.

39691969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-39691969 is a prime.

It is a super-2 number, since 2×39691969² = 3150904806193922, which contains 22 as substring.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1044507 + ... + 1044544.

It is an arithmetic number, because the mean of its divisors is an integer number (10445260).

Almost surely, 2^39691969 is an apocalyptic number.

It is an amenable number.

39691969 is a deficient number, since it is larger than the sum of its proper divisors (2089071).

39691969 is a wasteful number, since it uses less digits than its factorization.

39691969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089070.

The product of its digits is 708588, while the sum is 52.

The square root of 39691969 is about 6300.1562679032. The cubic root of 39691969 is about 341.1150502016.

The spelling of 39691969 in words is "thirty-nine million, six hundred ninety-one thousand, nine hundred sixty-nine".