1391551488 has 220 divisors, whose sum is σ = 4379106160. Its totient is φ = 438939648.

The previous prime is 1391551481. The next prime is 1391551493. The reversal of 1391551488 is 8841551931.

1391551488 is a `hidden beast` number, since 1 + 3 + 91 + 551 + 4 + 8 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1391551481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1575495 + ... + 1576377.

It is an arithmetic number, because the mean of its divisors is an integer number (19905028).

Almost surely, 2^1391551488 is an apocalyptic number.

1391551488 is a gapful number since it is divisible by the number (18) 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 1391551488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2189553080).

1391551488 is an abundant number, since it is smaller than the sum of its proper divisors (2987554672).

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

1391551488 is an equidigital number, since it uses as much as digits as its factorization.

1391551488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 907 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 1391551488 is about 37303.5050363903. The cubic root of 1391551488 is about 1116.4341009796.

The spelling of 1391551488 in words is "one billion, three hundred ninety-one million, five hundred fifty-one thousand, four hundred eighty-eight".