1391724882 has 128 divisors (see below), whose sum is σ = 3403948800. Its totient is φ = 419904000.

The previous prime is 1391724853. The next prime is 1391724883. The reversal of 1391724882 is 2884271931.

It is a happy number.

1391724882 is a `hidden beast` number, since 13 + 91 + 72 + 488 + 2 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1391724883) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2315382 + ... + 2315982.

It is an arithmetic number, because the mean of its divisors is an integer number (26593350).

Almost surely, 2^1391724882 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391724882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1701974400).

1391724882 is an abundant number, since it is smaller than the sum of its proper divisors (2012223918).

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

1391724882 is a wasteful number, since it uses less digits than its factorization.

1391724882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 723 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1391724882 is about 37305.8290619576. The cubic root of 1391724882 is about 1116.4804700710.

The spelling of 1391724882 in words is "one billion, three hundred ninety-one million, seven hundred twenty-four thousand, eight hundred eighty-two".