391430240 has 24 divisors (see below), whose sum is σ = 924754320. Its totient is φ = 156572032.

The previous prime is 391430209. The next prime is 391430279. The reversal of 391430240 is 42034193.

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 3 ways as a sum of consecutive naturals, for example, 1223060 + ... + 1223379.

It is an arithmetic number, because the mean of its divisors is an integer number (38531430).

Almost surely, 2^391430240 is an apocalyptic number.

It is an amenable number.

391430240 is an abundant number, since it is smaller than the sum of its proper divisors (533324080).

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

391430240 is a wasteful number, since it uses less digits than its factorization.

391430240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446454 (or 2446446 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 391430240 is about 19784.5960282236. The cubic root of 391430240 is about 731.5063908204.

The spelling of 391430240 in words is "three hundred ninety-one million, four hundred thirty thousand, two hundred forty".