397216155 has 32 divisors (see below), whose sum is σ = 743238144. Its totient is φ = 177359616.

The previous prime is 397216121. The next prime is 397216181. The reversal of 397216155 is 551612793.

397216155 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 397216155 - 2⁶ = 397216091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39474 + ... + 48503.

It is an arithmetic number, because the mean of its divisors is an integer number (23226192).

Almost surely, 2^397216155 is an apocalyptic number.

397216155 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

397216155 is a deficient number, since it is larger than the sum of its proper divisors (346021989).

397216155 is a wasteful number, since it uses less digits than its factorization.

397216155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88035.

The product of its digits is 56700, while the sum is 39.

The square root of 397216155 is about 19930.2823612713. The cubic root of 397216155 is about 735.0930235356.

The spelling of 397216155 in words is "three hundred ninety-seven million, two hundred sixteen thousand, one hundred fifty-five".