390457 has 4 divisors (see below), whose sum is σ = 391716. Its totient is φ = 389200.

The previous prime is 390449. The next prime is 390463. The reversal of 390457 is 754093.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 179776 + 210681 = 424^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 390457 - 2³ = 390449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207 + ... + 907.

It is an arithmetic number, because the mean of its divisors is an integer number (97929).

2³⁹⁰⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

390457 is a deficient number, since it is larger than the sum of its proper divisors (1259).

390457 is an equidigital number, since it uses as much as digits as its factorization.

390457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 390457 is about 624.8655855462. The cubic root of 390457 is about 73.0899622730.

The spelling of 390457 in words is "three hundred ninety thousand, four hundred fifty-seven".