39872643 has 16 divisors (see below), whose sum is σ = 55303680. Its totient is φ = 25530336.

The previous prime is 39872597. The next prime is 39872647. The reversal of 39872643 is 34627893.

It is not a de Polignac number, because 39872643 - 2⁸ = 39872387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39872595 and 39872604.

It is not an unprimeable number, because it can be changed into a prime (39872647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6496 + ... + 11042.

It is an arithmetic number, because the mean of its divisors is an integer number (3456480).

Almost surely, 2^39872643 is an apocalyptic number.

39872643 is a deficient number, since it is larger than the sum of its proper divisors (15431037).

39872643 is a wasteful number, since it uses less digits than its factorization.

39872643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666.

The product of its digits is 217728, while the sum is 42.

The square root of 39872643 is about 6314.4788383524. The cubic root of 39872643 is about 341.6318410931.

The spelling of 39872643 in words is "thirty-nine million, eight hundred seventy-two thousand, six hundred forty-three".