390866942 has 4 divisors (see below), whose sum is σ = 586300416. Its totient is φ = 195433470.

The previous prime is 390866929. The next prime is 390866963. The reversal of 390866942 is 249668093.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97716734 + ... + 97716737.

It is an arithmetic number, because the mean of its divisors is an integer number (146575104).

Almost surely, 2^390866942 is an apocalyptic number.

390866942 is a deficient number, since it is larger than the sum of its proper divisors (195433474).

390866942 is a wasteful number, since it uses less digits than its factorization.

390866942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195433473.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 390866942 is about 19770.3551308518. The cubic root of 390866942 is about 731.1553245144.

The spelling of 390866942 in words is "three hundred ninety million, eight hundred sixty-six thousand, nine hundred forty-two".