390442417 has 4 divisors (see below), whose sum is σ = 413409636. Its totient is φ = 367475200.

The previous prime is 390442387. The next prime is 390442421. The reversal of 390442417 is 714244093.

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: 714244093 = 23 ⋅31054091.

It can be written as a sum of positive squares in 2 ways, for example, as 301404321 + 89038096 = 17361^2 + 9436^2 .

It is a cyclic number.

It is not a de Polignac number, because 390442417 - 2⁷ = 390442289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390442447) 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, 11483584 + ... + 11483617.

It is an arithmetic number, because the mean of its divisors is an integer number (103352409).

Almost surely, 2^390442417 is an apocalyptic number.

It is an amenable number.

390442417 is a deficient number, since it is larger than the sum of its proper divisors (22967219).

390442417 is a wasteful number, since it uses less digits than its factorization.

390442417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22967218.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 390442417 is about 19759.6158110425. The cubic root of 390442417 is about 730.8905232716.

The spelling of 390442417 in words is "three hundred ninety million, four hundred forty-two thousand, four hundred seventeen".