39909880 has 64 divisors (see below), whose sum is σ = 100116000. Its totient is φ = 14229504.

The previous prime is 39909839. The next prime is 39909907. The reversal of 39909880 is 8890993.

It is a super-2 number, since 2×39909880² = 3185597043228800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39909880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11376 + ... + 14464.

Almost surely, 2^39909880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39909880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50058000).

39909880 is an abundant number, since it is smaller than the sum of its proper divisors (60206120).

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

39909880 is a wasteful number, since it uses less digits than its factorization.

39909880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136 (or 3132 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 39909880 is about 6317.4266913040. The cubic root of 39909880 is about 341.7381578207.

The spelling of 39909880 in words is "thirty-nine million, nine hundred nine thousand, eight hundred eighty".