1391591040 has 256 divisors, whose sum is σ = 5179576320. Its totient is φ = 311169024.

The previous prime is 1391591021. The next prime is 1391591059. The reversal of 1391591040 is 401951931.

It is an interprime number because it is at equal distance from previous prime (1391591021) and next prime (1391591059).

It is a junction number, because it is equal to n+sod(n) for n = 1391590992 and 1391591010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 630579 + ... + 632781.

It is an arithmetic number, because the mean of its divisors is an integer number (20232720).

Almost surely, 2^1391591040 is an apocalyptic number.

1391591040 is a gapful number since it is divisible by the number (10) 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 1391591040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2589788160).

1391591040 is an abundant number, since it is smaller than the sum of its proper divisors (3787985280).

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

1391591040 is a wasteful number, since it uses less digits than its factorization.

1391591040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279 (or 2267 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 1391591040 is about 37304.0351704745. The cubic root of 1391591040 is about 1116.4446783300. Note that the first 3 decimals are identical.

The spelling of 1391591040 in words is "one billion, three hundred ninety-one million, five hundred ninety-one thousand, forty".