397434836531 has 8 divisors (see below), whose sum is σ = 406687118640. Its totient is φ = 388182991392.

The previous prime is 397434836503. The next prime is 397434836551. The reversal of 397434836531 is 135638434793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397434836531 - 2¹⁰ = 397434835507 is a prime.

It is a super-2 number, since 2×397434836531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397434836551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2387201 + ... + 2548253.

It is an arithmetic number, because the mean of its divisors is an integer number (50835889830).

Almost surely, 2^397434836531 is an apocalyptic number.

397434836531 is a deficient number, since it is larger than the sum of its proper divisors (9252282109).

397434836531 is a wasteful number, since it uses less digits than its factorization.

397434836531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218485.

The product of its digits is 19595520, while the sum is 56.

The spelling of 397434836531 in words is "three hundred ninety-seven billion, four hundred thirty-four million, eight hundred thirty-six thousand, five hundred thirty-one".