397860457 has 4 divisors (see below), whose sum is σ = 401381460. Its totient is φ = 394339456.

The previous prime is 397860427. The next prime is 397860461. The reversal of 397860457 is 754068793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754068793 = 59 ⋅12780827.

It can be written as a sum of positive squares in 2 ways, for example, as 142468096 + 255392361 = 11936^2 + 15981^2 .

It is a cyclic number.

It is not a de Polignac number, because 397860457 - 2¹⁹ = 397336169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397860457.

It is not an unprimeable number, because it can be changed into a prime (397860427) 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 3 ways as a sum of consecutive naturals, for example, 1760332 + ... + 1760557.

It is an arithmetic number, because the mean of its divisors is an integer number (100345365).

Almost surely, 2^397860457 is an apocalyptic number.

It is an amenable number.

397860457 is a deficient number, since it is larger than the sum of its proper divisors (3521003).

397860457 is a wasteful number, since it uses less digits than its factorization.

397860457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521002.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 397860457 is about 19946.4397073764. The cubic root of 397860457 is about 735.4902598608.

The spelling of 397860457 in words is "three hundred ninety-seven million, eight hundred sixty thousand, four hundred fifty-seven".