391978348 has 12 divisors (see below), whose sum is σ = 686239792. Its totient is φ = 195909840.

The previous prime is 391978309. The next prime is 391978369. The reversal of 391978348 is 843879193.

It is a junction number, because it is equal to n+sod(n) for n = 391978295 and 391978304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7923 + ... + 29098.

Almost surely, 2^391978348 is an apocalyptic number.

It is an amenable number.

391978348 is a deficient number, since it is larger than the sum of its proper divisors (294261444).

391978348 is a wasteful number, since it uses less digits than its factorization.

391978348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39672 (or 39670 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 391978348 is about 19798.4430701002. The cubic root of 391978348 is about 731.8476670478.

The spelling of 391978348 in words is "three hundred ninety-one million, nine hundred seventy-eight thousand, three hundred forty-eight".