39129889 has 2 divisors, whose sum is σ = 39129890. Its totient is φ = 39129888.

The previous prime is 39129887. The next prime is 39129919. The reversal of 39129889 is 98892193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24750625 + 14379264 = 4975^2 + 3792^2 .

It is an emirp because it is prime and its reverse (98892193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39129889 - 2¹ = 39129887 is a prime.

It is a super-2 number, since 2×39129889² = 3062296426304642, which contains 22 as substring.

Together with 39129887, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39129887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19564944 + 19564945.

It is an arithmetic number, because the mean of its divisors is an integer number (19564945).

Almost surely, 2^39129889 is an apocalyptic number.

It is an amenable number.

39129889 is a deficient number, since it is larger than the sum of its proper divisors (1).

39129889 is an equidigital number, since it uses as much as digits as its factorization.

39129889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 39129889 is about 6255.3887968695. The cubic root of 39129889 is about 339.4972066607.

The spelling of 39129889 in words is "thirty-nine million, one hundred twenty-nine thousand, eight hundred eighty-nine".