1156253840 has 80 divisors (see below), whose sum is σ = 3118288512. Its totient is φ = 390500352.

The previous prime is 1156253837. The next prime is 1156253881. The reversal of 1156253840 is 483526511.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1156253840.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22112 + ... + 52928.

Almost surely, 2^1156253840 is an apocalyptic number.

1156253840 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 1156253840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1559144256).

1156253840 is an abundant number, since it is smaller than the sum of its proper divisors (1962034672).

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

1156253840 is a wasteful number, since it uses less digits than its factorization.

1156253840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30904 (or 30898 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1156253840 is about 34003.7327362747. The cubic root of 1156253840 is about 1049.5852753688.

The spelling of 1156253840 in words is "one billion, one hundred fifty-six million, two hundred fifty-three thousand, eight hundred forty".