39993557 has 2 divisors, whose sum is σ = 39993558. Its totient is φ = 39993556.

The previous prime is 39993553. The next prime is 39993593. The reversal of 39993557 is 75539993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 164836 = 6311^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 39993557 - 2² = 39993553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39993553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19996778 + 19996779.

It is an arithmetic number, because the mean of its divisors is an integer number (19996779).

Almost surely, 2^39993557 is an apocalyptic number.

It is an amenable number.

39993557 is a deficient number, since it is larger than the sum of its proper divisors (1).

39993557 is an equidigital number, since it uses as much as digits as its factorization.

39993557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1148175, while the sum is 50.

The square root of 39993557 is about 6324.0459359495. The cubic root of 39993557 is about 341.9768260576.

The spelling of 39993557 in words is "thirty-nine million, nine hundred ninety-three thousand, five hundred fifty-seven".