391259904 has 216 divisors, whose sum is σ = 1248499728. Its totient is φ = 108380160.

The previous prime is 391259899. The next prime is 391259929. The reversal of 391259904 is 409952193.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1392244 + ... + 1392524.

Almost surely, 2^391259904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391259904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (624249864).

391259904 is an abundant number, since it is smaller than the sum of its proper divisors (857239824).

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

391259904 is a wasteful number, since it uses less digits than its factorization.

391259904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 391259904 is about 19780.2907966491. The cubic root of 391259904 is about 731.4002672269.

The spelling of 391259904 in words is "three hundred ninety-one million, two hundred fifty-nine thousand, nine hundred four".