39906433 has 12 divisors (see below), whose sum is σ = 46548480. Its totient is φ = 34112232.

The previous prime is 39906421. The next prime is 39906437. The reversal of 39906433 is 33460993.

It is not a de Polignac number, because 39906433 - 2²¹ = 37809281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39906392 and 39906401.

It is not an unprimeable number, because it can be changed into a prime (39906437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21808 + ... + 23566.

It is an arithmetic number, because the mean of its divisors is an integer number (3879040).

Almost surely, 2^39906433 is an apocalyptic number.

It is an amenable number.

39906433 is a deficient number, since it is larger than the sum of its proper divisors (6642047).

39906433 is a wasteful number, since it uses less digits than its factorization.

39906433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236 (or 2229 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 37.

The square root of 39906433 is about 6317.1538686342. The cubic root of 39906433 is about 341.7283189425.

The spelling of 39906433 in words is "thirty-nine million, nine hundred six thousand, four hundred thirty-three".