39970157 has 2 divisors, whose sum is σ = 39970158. Its totient is φ = 39970156.

The previous prime is 39970141. The next prime is 39970169. The reversal of 39970157 is 75107993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 12292036 = 5261^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 39970157 - 2⁴ = 39970141 is a prime.

It is a super-2 number, since 2×39970157² = 3195226901209298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39970187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19985078 + 19985079.

It is an arithmetic number, because the mean of its divisors is an integer number (19985079).

Almost surely, 2^39970157 is an apocalyptic number.

It is an amenable number.

39970157 is a deficient number, since it is larger than the sum of its proper divisors (1).

39970157 is an equidigital number, since it uses as much as digits as its factorization.

39970157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 39970157 is about 6322.1955838142. The cubic root of 39970157 is about 341.9101168214.

The spelling of 39970157 in words is "thirty-nine million, nine hundred seventy thousand, one hundred fifty-seven".