39129987 has 16 divisors (see below), whose sum is σ = 59144960. Its totient is φ = 22812192.

The previous prime is 39129983. The next prime is 39129997. The reversal of 39129987 is 78992193.

It is not a de Polignac number, because 39129987 - 2² = 39129983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39129983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25663 + ... + 27144.

It is an arithmetic number, because the mean of its divisors is an integer number (3696560).

Almost surely, 2^39129987 is an apocalyptic number.

39129987 is a deficient number, since it is larger than the sum of its proper divisors (20014973).

39129987 is a wasteful number, since it uses less digits than its factorization.

39129987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52842.

The product of its digits is 244944, while the sum is 48.

The square root of 39129987 is about 6255.3966301107. The cubic root of 39129987 is about 339.4974900817.

The spelling of 39129987 in words is "thirty-nine million, one hundred twenty-nine thousand, nine hundred eighty-seven".