39906520 has 16 divisors (see below), whose sum is σ = 89789760. Its totient is φ = 15962592.

The previous prime is 39906499. The next prime is 39906533. The reversal of 39906520 is 2560993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498792 + ... + 498871.

It is an arithmetic number, because the mean of its divisors is an integer number (5611860).

Almost surely, 2^39906520 is an apocalyptic number.

It is an amenable number.

39906520 is an abundant number, since it is smaller than the sum of its proper divisors (49883240).

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

39906520 is a wasteful number, since it uses less digits than its factorization.

39906520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997674 (or 997670 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 39906520 is about 6317.1607546429. The cubic root of 39906520 is about 341.7285672763.

The spelling of 39906520 in words is "thirty-nine million, nine hundred six thousand, five hundred twenty".