39997087 has 4 divisors (see below), whose sum is σ = 43073800. Its totient is φ = 36920376.

The previous prime is 39997079. The next prime is 39997091. The reversal of 39997087 is 78079993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78079993 = 7237 ⋅10789.

It is a cyclic number.

It is not a de Polignac number, because 39997087 - 2³ = 39997079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39997387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538337 + ... + 1538362.

It is an arithmetic number, because the mean of its divisors is an integer number (10768450).

Almost surely, 2^39997087 is an apocalyptic number.

39997087 is a deficient number, since it is larger than the sum of its proper divisors (3076713).

39997087 is a wasteful number, since it uses less digits than its factorization.

39997087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3076712.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 39997087 is about 6324.3250232732. The cubic root of 39997087 is about 341.9868872006.

The spelling of 39997087 in words is "thirty-nine million, nine hundred ninety-seven thousand, eighty-seven".