397820315215 has 16 divisors (see below), whose sum is σ = 484565188608. Its totient is φ = 313470137376.

The previous prime is 397820315161. The next prime is 397820315239. The reversal of 397820315215 is 512513028793.

It is a cyclic number.

It is not a de Polignac number, because 397820315215 - 2¹¹ = 397820313167 is a prime.

It is a super-2 number, since 2×397820315215² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3066354 + ... + 3193456.

It is an arithmetic number, because the mean of its divisors is an integer number (30285324288).

Almost surely, 2^397820315215 is an apocalyptic number.

397820315215 is a deficient number, since it is larger than the sum of its proper divisors (86744873393).

397820315215 is a wasteful number, since it uses less digits than its factorization.

397820315215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136518.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 397820315215 in words is "three hundred ninety-seven billion, eight hundred twenty million, three hundred fifteen thousand, two hundred fifteen".