391652940 has 96 divisors (see below), whose sum is σ = 1273918464. Its totient is φ = 88047360.

The previous prime is 391652929. The next prime is 391652959. The reversal of 391652940 is 49256193.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17977 + ... + 33263.

It is an arithmetic number, because the mean of its divisors is an integer number (13269984).

Almost surely, 2^391652940 is an apocalyptic number.

391652940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391652940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (636959232).

391652940 is an abundant number, since it is smaller than the sum of its proper divisors (882265524).

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

391652940 is a wasteful number, since it uses less digits than its factorization.

391652940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15367 (or 15365 counting only the distinct ones).

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

The square root of 391652940 is about 19790.2233438635. The cubic root of 391652940 is about 731.6450920684.

The spelling of 391652940 in words is "three hundred ninety-one million, six hundred fifty-two thousand, nine hundred forty".