39981087 has 8 divisors (see below), whose sum is σ = 59231280. Its totient is φ = 26654040.

The previous prime is 39981083. The next prime is 39981101. The reversal of 39981087 is 78018993.

It is not a de Polignac number, because 39981087 - 2² = 39981083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39981083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740364 + ... + 740417.

It is an arithmetic number, because the mean of its divisors is an integer number (7403910).

Almost surely, 2^39981087 is an apocalyptic number.

39981087 is a deficient number, since it is larger than the sum of its proper divisors (19250193).

39981087 is a wasteful number, since it uses less digits than its factorization.

39981087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480790 (or 1480784 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 39981087 is about 6323.0599396178. The cubic root of 39981087 is about 341.9412795460.

The spelling of 39981087 in words is "thirty-nine million, nine hundred eighty-one thousand, eighty-seven".