1156197888 has 120 divisors (see below), whose sum is σ = 3460825368. Its totient is φ = 385357824.

The previous prime is 1156197883. The next prime is 1156197893. The reversal of 1156197888 is 8887916511.

It is a happy number.

1156197888 is a `hidden beast` number, since 1 + 1 + 561 + 9 + 78 + 8 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1156197883) and next prime (1156197893).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156197883) 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 11 ways as a sum of consecutive naturals, for example, 119770 + ... + 129062.

Almost surely, 2^1156197888 is an apocalyptic number.

1156197888 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 1156197888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1730412684).

1156197888 is an abundant number, since it is smaller than the sum of its proper divisors (2304627480).

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

1156197888 is an frugal number, since it uses more digits than its factorization.

1156197888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9326 (or 9298 counting only the distinct ones).

The product of its digits is 967680, while the sum is 54.

The square root of 1156197888 is about 34002.9099931168. The cubic root of 1156197888 is about 1049.5683450199.

The spelling of 1156197888 in words is "one billion, one hundred fifty-six million, one hundred ninety-seven thousand, eight hundred eighty-eight".