167640397 has 2 divisors, whose sum is σ = 167640398. Its totient is φ = 167640396.

The previous prime is 167640337. The next prime is 167640409. The reversal of 167640397 is 793046761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98982601 + 68657796 = 9949^2 + 8286^2 .

It is a cyclic number.

It is not a de Polignac number, because 167640397 - 2⁷ = 167640269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167640337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83820198 + 83820199.

It is an arithmetic number, because the mean of its divisors is an integer number (83820199).

Almost surely, 2^167640397 is an apocalyptic number.

It is an amenable number.

167640397 is a deficient number, since it is larger than the sum of its proper divisors (1).

167640397 is an equidigital number, since it uses as much as digits as its factorization.

167640397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 167640397 is about 12947.6019787449. The cubic root of 167640397 is about 551.3908566542.

The spelling of 167640397 in words is "one hundred sixty-seven million, six hundred forty thousand, three hundred ninety-seven".