391678412 has 12 divisors (see below), whose sum is σ = 702155496. Its totient is φ = 191062560.

The previous prime is 391678381. The next prime is 391678421. The reversal of 391678412 is 214876193.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a self number, because there is not a number n which added to its sum of digits gives 391678412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193978 + ... + 1194305.

It is an arithmetic number, because the mean of its divisors is an integer number (58512958).

Almost surely, 2^391678412 is an apocalyptic number.

It is an amenable number.

391678412 is a deficient number, since it is larger than the sum of its proper divisors (310477084).

391678412 is a wasteful number, since it uses less digits than its factorization.

391678412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388328 (or 2388326 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 391678412 is about 19790.8668834895. The cubic root of 391678412 is about 731.6609531007.

It can be divided in two parts, 3916 and 78412, that added together give a palindrome (82328).

The spelling of 391678412 in words is "three hundred ninety-one million, six hundred seventy-eight thousand, four hundred twelve".