391463040 has 128 divisors (see below), whose sum is σ = 1288235520. Its totient is φ = 101007360.

The previous prime is 391463027. The next prime is 391463087. The reversal of 391463040 is 40364193.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 391462989 and 391463007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56232 + ... + 62808.

It is an arithmetic number, because the mean of its divisors is an integer number (10064340).

Almost surely, 2^391463040 is an apocalyptic number.

391463040 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 391463040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (644117760).

391463040 is an abundant number, since it is smaller than the sum of its proper divisors (896772480).

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

391463040 is a wasteful number, since it uses less digits than its factorization.

391463040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630 (or 6618 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 391463040 is about 19785.4249385754. The cubic root of 391463040 is about 731.5268225066.

The spelling of 391463040 in words is "three hundred ninety-one million, four hundred sixty-three thousand, forty".