391481938 has 8 divisors (see below), whose sum is σ = 595987632. Its totient is φ = 192819396.

The previous prime is 391481929. The next prime is 391481953. The reversal of 391481938 is 839184193.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1460620 + ... + 1460887.

It is an arithmetic number, because the mean of its divisors is an integer number (74498454).

Almost surely, 2^391481938 is an apocalyptic number.

391481938 is a deficient number, since it is larger than the sum of its proper divisors (204505694).

391481938 is a wasteful number, since it uses less digits than its factorization.

391481938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921576.

The product of its digits is 186624, while the sum is 46.

The square root of 391481938 is about 19785.9025065828. The cubic root of 391481938 is about 731.5385938788.

The spelling of 391481938 in words is "three hundred ninety-one million, four hundred eighty-one thousand, nine hundred thirty-eight".