39231989 has 2 divisors, whose sum is σ = 39231990. Its totient is φ = 39231988.

The previous prime is 39231949. The next prime is 39232003. The reversal of 39231989 is 98913293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37920964 + 1311025 = 6158^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 39231989 - 2¹² = 39227893 is a prime.

It is a super-2 number, since 2×39231989² = 3078297921792242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39231919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19615994 + 19615995.

It is an arithmetic number, because the mean of its divisors is an integer number (19615995).

Almost surely, 2^39231989 is an apocalyptic number.

It is an amenable number.

39231989 is a deficient number, since it is larger than the sum of its proper divisors (1).

39231989 is an equidigital number, since it uses as much as digits as its factorization.

39231989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 39231989 is about 6263.5444438433. The cubic root of 39231989 is about 339.7922288834.

The spelling of 39231989 in words is "thirty-nine million, two hundred thirty-one thousand, nine hundred eighty-nine".