1391155752 has 256 divisors, whose sum is σ = 4342579200. Its totient is φ = 362880000.

The previous prime is 1391155751. The next prime is 1391155763. The reversal of 1391155752 is 2575511931.

It is a self number, because there is not a number n which added to its sum of digits gives 1391155752.

It is not an unprimeable number, because it can be changed into a prime (1391155751) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9212877 + ... + 9213027.

It is an arithmetic number, because the mean of its divisors is an integer number (16963200).

Almost surely, 2^1391155752 is an apocalyptic number.

1391155752 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 1391155752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171289600).

1391155752 is an abundant number, since it is smaller than the sum of its proper divisors (2951423448).

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

1391155752 is a wasteful number, since it uses less digits than its factorization.

1391155752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 284 counting only the distinct ones).

The product of its digits is 47250, while the sum is 39.

The square root of 1391155752 is about 37298.2003855414. The cubic root of 1391155752 is about 1116.3282586739.

The spelling of 1391155752 in words is "one billion, three hundred ninety-one million, one hundred fifty-five thousand, seven hundred fifty-two".