391427904 has 112 divisors (see below), whose sum is σ = 1189744128. Its totient is φ = 111257088.

The previous prime is 391427893. The next prime is 391427947. The reversal of 391427904 is 409724193.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304447 + ... + 305729.

Almost surely, 2^391427904 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 391427904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (594872064).

391427904 is an abundant number, since it is smaller than the sum of its proper divisors (798316224).

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

391427904 is a wasteful number, since it uses less digits than its factorization.

391427904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1522 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 391427904 is about 19784.5369923079. The cubic root of 391427904 is about 731.5049356421.

The spelling of 391427904 in words is "three hundred ninety-one million, four hundred twenty-seven thousand, nine hundred four".