697394157 has 12 divisors (see below), whose sum is σ = 935918496. Its totient is φ = 461919120.

The previous prime is 697394153. The next prime is 697394189. The reversal of 697394157 is 751493796.

It is not a de Polignac number, because 697394157 - 2² = 697394153 is a prime.

It is a super-2 number, since 2×697394157² = 972717220435481298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697394153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69232 + ... + 78662.

It is an arithmetic number, because the mean of its divisors is an integer number (77993208).

Almost surely, 2^697394157 is an apocalyptic number.

It is an amenable number.

697394157 is a deficient number, since it is larger than the sum of its proper divisors (238524339).

697394157 is an equidigital number, since it uses as much as digits as its factorization.

697394157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9748 (or 9591 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 51.

The square root of 697394157 is about 26408.2213903171. The cubic root of 697394157 is about 886.8008515300.

The spelling of 697394157 in words is "six hundred ninety-seven million, three hundred ninety-four thousand, one hundred fifty-seven".