39487987 has 24 divisors (see below), whose sum is σ = 51787008. Its totient is φ = 29417520.

The previous prime is 39487979. The next prime is 39488011. The reversal of 39487987 is 78978493.

It is not a de Polignac number, because 39487987 - 2³ = 39487979 is a prime.

It is a super-2 number, since 2×39487987² = 3118602234624338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39481987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18468 + ... + 20494.

It is an arithmetic number, because the mean of its divisors is an integer number (2157792).

Almost surely, 2^39487987 is an apocalyptic number.

39487987 is a deficient number, since it is larger than the sum of its proper divisors (12299021).

39487987 is a wasteful number, since it uses less digits than its factorization.

39487987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079 (or 2068 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 55.

The square root of 39487987 is about 6283.9467693481. The cubic root of 39487987 is about 340.5297020054.

It can be divided in two parts, 3948 and 7987, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 39487987 in words is "thirty-nine million, four hundred eighty-seven thousand, nine hundred eighty-seven".