390397861 has 8 divisors (see below), whose sum is σ = 446405120. Its totient is φ = 334449648.

The previous prime is 390397853. The next prime is 390397901. The reversal of 390397861 is 168793093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 390397861 - 2³ = 390397853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390397801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460 + ... + 27946.

It is an arithmetic number, because the mean of its divisors is an integer number (55800640).

Almost surely, 2^390397861 is an apocalyptic number.

It is an amenable number.

390397861 is a deficient number, since it is larger than the sum of its proper divisors (56007259).

390397861 is a wasteful number, since it uses less digits than its factorization.

390397861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29523.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 390397861 is about 19758.4883278048. The cubic root of 390397861 is about 730.8627199426.

The spelling of 390397861 in words is "three hundred ninety million, three hundred ninety-seven thousand, eight hundred sixty-one".