391959240 has 32 divisors (see below), whose sum is σ = 1175878080. Its totient is φ = 104522432.

The previous prime is 391959223. The next prime is 391959287. The reversal of 391959240 is 42959193.

It is a junction number, because it is equal to n+sod(n) for n = 391959192 and 391959201.

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, 1633044 + ... + 1633283.

It is an arithmetic number, because the mean of its divisors is an integer number (36746190).

Almost surely, 2^391959240 is an apocalyptic number.

391959240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

391959240 is an abundant number, since it is smaller than the sum of its proper divisors (783918840).

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

391959240 is a wasteful number, since it uses less digits than its factorization.

391959240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266341 (or 3266337 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 391959240 is about 19797.9605010213. The cubic root of 391959240 is about 731.8357749177.

The spelling of 391959240 in words is "three hundred ninety-one million, nine hundred fifty-nine thousand, two hundred forty".