397637421 has 8 divisors (see below), whose sum is σ = 531757824. Its totient is φ = 264304320.

The previous prime is 397637419. The next prime is 397637459. The reversal of 397637421 is 124736793.

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

It is not a de Polignac number, because 397637421 - 2¹ = 397637419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397637411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195645 + ... + 197666.

It is an arithmetic number, because the mean of its divisors is an integer number (66469728).

Almost surely, 2^397637421 is an apocalyptic number.

It is an amenable number.

397637421 is a deficient number, since it is larger than the sum of its proper divisors (134120403).

397637421 is a wasteful number, since it uses less digits than its factorization.

397637421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393651.

The product of its digits is 190512, while the sum is 42.

The square root of 397637421 is about 19940.8480511738. The cubic root of 397637421 is about 735.3527983754.

The spelling of 397637421 in words is "three hundred ninety-seven million, six hundred thirty-seven thousand, four hundred twenty-one".