390575421 has 12 divisors (see below), whose sum is σ = 564340348. Its totient is φ = 260302464.

The previous prime is 390575413. The next prime is 390575431. The reversal of 390575421 is 124575093.

It can be written as a sum of positive squares in 2 ways, for example, as 251571321 + 139004100 = 15861^2 + 11790^2 .

It is not a de Polignac number, because 390575421 - 2³ = 390575413 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 (390575401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42951 + ... + 51243.

Almost surely, 2^390575421 is an apocalyptic number.

It is an amenable number.

390575421 is a deficient number, since it is larger than the sum of its proper divisors (173764927).

390575421 is a wasteful number, since it uses less digits than its factorization.

390575421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13532 (or 13529 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 390575421 is about 19762.9810757385. The cubic root of 390575421 is about 730.9735063379.

The spelling of 390575421 in words is "three hundred ninety million, five hundred seventy-five thousand, four hundred twenty-one".