397453213 has 4 divisors (see below), whose sum is σ = 399470940. Its totient is φ = 395435488.

The previous prime is 397453163. The next prime is 397453241. The reversal of 397453213 is 312354793.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259789924 + 137663289 = 16118^2 + 11733^2 .

It is a cyclic number.

It is not a de Polignac number, because 397453213 - 2¹⁷ = 397322141 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 (397453253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1008568 + ... + 1008961.

It is an arithmetic number, because the mean of its divisors is an integer number (99867735).

Almost surely, 2^397453213 is an apocalyptic number.

It is an amenable number.

397453213 is a deficient number, since it is larger than the sum of its proper divisors (2017727).

397453213 is a wasteful number, since it uses less digits than its factorization.

397453213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017726.

The product of its digits is 68040, while the sum is 37.

The square root of 397453213 is about 19936.2286553902. The cubic root of 397453213 is about 735.2392285890.

The spelling of 397453213 in words is "three hundred ninety-seven million, four hundred fifty-three thousand, two hundred thirteen".