391693946 has 24 divisors (see below), whose sum is σ = 684153216. Its totient is φ = 167700120.

The previous prime is 391693931. The next prime is 391693961. The reversal of 391693946 is 649396193.

It is an interprime number because it is at equal distance from previous prime (391693931) and next prime (391693961).

It is a junction number, because it is equal to n+sod(n) for n = 391693894 and 391693903.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176375 + ... + 178581.

It is an arithmetic number, because the mean of its divisors is an integer number (28506384).

Almost surely, 2^391693946 is an apocalyptic number.

391693946 is a deficient number, since it is larger than the sum of its proper divisors (292459270).

391693946 is a wasteful number, since it uses less digits than its factorization.

391693946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034 (or 4027 counting only the distinct ones).

The product of its digits is 944784, while the sum is 50.

The square root of 391693946 is about 19791.2593333522. The cubic root of 391693946 is about 731.6706255519.

The spelling of 391693946 in words is "three hundred ninety-one million, six hundred ninety-three thousand, nine hundred forty-six".