390793661 has 4 divisors (see below), whose sum is σ = 392952924. Its totient is φ = 388634400.

The previous prime is 390793643. The next prime is 390793681. The reversal of 390793661 is 166397093.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132388036 + 258405625 = 11506^2 + 16075^2 .

It is a cyclic number.

It is not a de Polignac number, because 390793661 - 2⁶ = 390793597 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 (390793681) 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, 1079360 + ... + 1079721.

It is an arithmetic number, because the mean of its divisors is an integer number (98238231).

Almost surely, 2^390793661 is an apocalyptic number.

It is an amenable number.

390793661 is a deficient number, since it is larger than the sum of its proper divisors (2159263).

390793661 is a wasteful number, since it uses less digits than its factorization.

390793661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159262.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 390793661 is about 19768.5017388774. The cubic root of 390793661 is about 731.1096285360.

The spelling of 390793661 in words is "three hundred ninety million, seven hundred ninety-three thousand, six hundred sixty-one".