393699157 has 4 divisors (see below), whose sum is σ = 407275020. Its totient is φ = 380123296.

The previous prime is 393699149. The next prime is 393699161. The reversal of 393699157 is 751996393.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 284057316 + 109641841 = 16854^2 + 10471^2 .

It is a cyclic number.

It is not a de Polignac number, because 393699157 - 2³ = 393699149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393699167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6787888 + ... + 6787945.

It is an arithmetic number, because the mean of its divisors is an integer number (101818755).

Almost surely, 2^393699157 is an apocalyptic number.

It is an amenable number.

393699157 is a deficient number, since it is larger than the sum of its proper divisors (13575863).

393699157 is a wasteful number, since it uses less digits than its factorization.

393699157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13575862.

The product of its digits is 1377810, while the sum is 52.

The square root of 393699157 is about 19841.8536684454. The cubic root of 393699157 is about 732.9170557323.

The spelling of 393699157 in words is "three hundred ninety-three million, six hundred ninety-nine thousand, one hundred fifty-seven".