39157889 has 2 divisors, whose sum is σ = 39157890. Its totient is φ = 39157888.

The previous prime is 39157883. The next prime is 39157897. The reversal of 39157889 is 98875193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25170289 + 13987600 = 5017^2 + 3740^2 .

It is an emirp because it is prime and its reverse (98875193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39157889 - 2⁸ = 39157633 is a prime.

It is not a weakly prime, because it can be changed into another prime (39157883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19578944 + 19578945.

It is an arithmetic number, because the mean of its divisors is an integer number (19578945).

Almost surely, 2^39157889 is an apocalyptic number.

It is an amenable number.

39157889 is a deficient number, since it is larger than the sum of its proper divisors (1).

39157889 is an equidigital number, since it uses as much as digits as its factorization.

39157889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 39157889 is about 6257.6264669601. The cubic root of 39157889 is about 339.5781648537.

The spelling of 39157889 in words is "thirty-nine million, one hundred fifty-seven thousand, eight hundred eighty-nine".