391378476 has 12 divisors (see below), whose sum is σ = 913216472. Its totient is φ = 130459488.

The previous prime is 391378469. The next prime is 391378487. The reversal of 391378476 is 674873193.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×391378476² = 306354222952165152, which contains 22 as substring.

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, 16307425 + ... + 16307448.

Almost surely, 2^391378476 is an apocalyptic number.

It is an amenable number.

391378476 is an abundant number, since it is smaller than the sum of its proper divisors (521837996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391378476 is a wasteful number, since it uses less digits than its factorization.

391378476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32614880 (or 32614878 counting only the distinct ones).

The product of its digits is 762048, while the sum is 48.

The square root of 391378476 is about 19783.2877955106. The cubic root of 391378476 is about 731.4741438091.

The spelling of 391378476 in words is "three hundred ninety-one million, three hundred seventy-eight thousand, four hundred seventy-six".