39903920 has 40 divisors (see below), whose sum is σ = 106031904. Its totient is φ = 13681152.

The previous prime is 39903901. The next prime is 39903931. The reversal of 39903920 is 2930993.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a plaindrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35069 + ... + 36188.

Almost surely, 2^39903920 is an apocalyptic number.

It is an amenable number.

39903920 is an abundant number, since it is smaller than the sum of its proper divisors (66127984).

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

39903920 is a wasteful number, since it uses less digits than its factorization.

39903920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71277 (or 71271 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 35.

The square root of 39903920 is about 6316.9549626382. The cubic root of 39903920 is about 341.7211456522.

The spelling of 39903920 in words is "thirty-nine million, nine hundred three thousand, nine hundred twenty".