391256940 has 24 divisors (see below), whose sum is σ = 1095519600. Its totient is φ = 104335168.

The previous prime is 391256909. The next prime is 391256953. The reversal of 391256940 is 49652193.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3260415 + ... + 3260534.

It is an arithmetic number, because the mean of its divisors is an integer number (45646650).

Almost surely, 2^391256940 is an apocalyptic number.

391256940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

391256940 is an abundant number, since it is smaller than the sum of its proper divisors (704262660).

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

391256940 is a wasteful number, since it uses less digits than its factorization.

391256940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6520961 (or 6520959 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 391256940 is about 19780.2158734428. The cubic root of 391256940 is about 731.3984203081.

The spelling of 391256940 in words is "three hundred ninety-one million, two hundred fifty-six thousand, nine hundred forty".