391086396 has 18 divisors (see below), whose sum is σ = 988579592. Its totient is φ = 130362120.

The previous prime is 391086361. The next prime is 391086401. The reversal of 391086396 is 693680193.

391086396 is a `hidden beast` number, since 3 + 9 + 1 + 0 + 8 + 639 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5431720 + ... + 5431791.

Almost surely, 2^391086396 is an apocalyptic number.

391086396 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

391086396 is an abundant number, since it is smaller than the sum of its proper divisors (597493196).

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

391086396 is a wasteful number, since it uses less digits than its factorization.

391086396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10863521 (or 10863516 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 391086396 is about 19775.9044293807. The cubic root of 391086396 is about 731.2921357268.

The spelling of 391086396 in words is "three hundred ninety-one million, eighty-six thousand, three hundred ninety-six".