390293561 has 4 divisors (see below), whose sum is σ = 446049792. Its totient is φ = 334537332.

The previous prime is 390293489. The next prime is 390293587. The reversal of 390293561 is 165392093.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390293561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (390293591) 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, 27878105 + ... + 27878118.

It is an arithmetic number, because the mean of its divisors is an integer number (111512448).

Almost surely, 2^390293561 is an apocalyptic number.

It is an amenable number.

390293561 is a deficient number, since it is larger than the sum of its proper divisors (55756231).

390293561 is an equidigital number, since it uses as much as digits as its factorization.

390293561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55756230.

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 390293561 is about 19755.8487795387. The cubic root of 390293561 is about 730.7976275682.

The spelling of 390293561 in words is "three hundred ninety million, two hundred ninety-three thousand, five hundred sixty-one".