39129387 has 32 divisors (see below), whose sum is σ = 59389440. Its totient is φ = 22705920.

The previous prime is 39129383. The next prime is 39129397. The reversal of 39129387 is 78392193.

It is not a de Polignac number, because 39129387 - 2² = 39129383 is a prime.

It is a super-2 number, since 2×39129387² = 3062217853991538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39129383) 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 31 ways as a sum of consecutive naturals, for example, 88914 + ... + 89352.

It is an arithmetic number, because the mean of its divisors is an integer number (1855920).

Almost surely, 2^39129387 is an apocalyptic number.

39129387 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

39129387 is a deficient number, since it is larger than the sum of its proper divisors (20260053).

39129387 is a wasteful number, since it uses less digits than its factorization.

39129387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563.

The product of its digits is 81648, while the sum is 42.

The square root of 39129387 is about 6255.3486713372. The cubic root of 39129387 is about 339.4957548436.

The spelling of 39129387 in words is "thirty-nine million, one hundred twenty-nine thousand, three hundred eighty-seven".