397764307421 has 16 divisors (see below), whose sum is σ = 443260984320. Its totient is φ = 354454047360.

The previous prime is 397764307403. The next prime is 397764307459. The reversal of 397764307421 is 124703467793.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 397764307421 - 2³⁴ = 380584438237 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 (397764307471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1041785 + ... + 1371438.

It is an arithmetic number, because the mean of its divisors is an integer number (27703811520).

Almost surely, 2^397764307421 is an apocalyptic number.

397764307421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

397764307421 is a deficient number, since it is larger than the sum of its proper divisors (45496676899).

397764307421 is a wasteful number, since it uses less digits than its factorization.

397764307421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413676.

The product of its (nonzero) digits is 5334336, while the sum is 53.

The spelling of 397764307421 in words is "three hundred ninety-seven billion, seven hundred sixty-four million, three hundred seven thousand, four hundred twenty-one".