1391288832 has 160 divisors (see below), whose sum is σ = 4335883200. Its totient is φ = 439271424.

The previous prime is 1391288831. The next prime is 1391288861. The reversal of 1391288832 is 2388821931.

It is a happy number.

It is a super-2 number, since 2×1391288832² = 3871369228095848448, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1391288831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260008 + ... + 265304.

It is an arithmetic number, because the mean of its divisors is an integer number (27099270).

Almost surely, 2^1391288832 is an apocalyptic number.

1391288832 is a gapful number since it is divisible by the number (12) 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 1391288832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2167941600).

1391288832 is an abundant number, since it is smaller than the sum of its proper divisors (2944594368).

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

1391288832 is an equidigital number, since it uses as much as digits as its factorization.

1391288832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343 (or 5321 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 1391288832 is about 37299.9843431603. The cubic root of 1391288832 is about 1116.3638540719.

The spelling of 1391288832 in words is "one billion, three hundred ninety-one million, two hundred eighty-eight thousand, eight hundred thirty-two".