397481213 has 4 divisors (see below), whose sum is σ = 398627040. Its totient is φ = 396335388.

The previous prime is 397481179. The next prime is 397481237. The reversal of 397481213 is 312184793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312184793 = 11173 ⋅27941.

It is a cyclic number.

It is not a de Polignac number, because 397481213 - 2⁸ = 397480957 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 (397481243) 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, 572393 + ... + 573086.

It is an arithmetic number, because the mean of its divisors is an integer number (99656760).

Almost surely, 2^397481213 is an apocalyptic number.

It is an amenable number.

397481213 is a deficient number, since it is larger than the sum of its proper divisors (1145827).

397481213 is a wasteful number, since it uses less digits than its factorization.

397481213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145826.

The product of its digits is 36288, while the sum is 38.

The square root of 397481213 is about 19936.9308821594. The cubic root of 397481213 is about 735.2564936945.

The spelling of 397481213 in words is "three hundred ninety-seven million, four hundred eighty-one thousand, two hundred thirteen".