39915081 has 12 divisors (see below), whose sum is σ = 57931120. Its totient is φ = 26482680.

The previous prime is 39915061. The next prime is 39915089. The reversal of 39915081 is 18051993.

It is a happy number.

It is not a de Polignac number, because 39915081 - 2⁹ = 39914569 is a prime.

It is a super-2 number, since 2×39915081² = 3186427382473122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39915089) 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, 8611 + ... + 12408.

Almost surely, 2^39915081 is an apocalyptic number.

It is an amenable number.

39915081 is a deficient number, since it is larger than the sum of its proper divisors (18016039).

39915081 is a wasteful number, since it uses less digits than its factorization.

39915081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21236 (or 21233 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 39915081 is about 6317.8383170195. The cubic root of 39915081 is about 341.7530021229.

The spelling of 39915081 in words is "thirty-nine million, nine hundred fifteen thousand, eighty-one".