1157988 has 36 divisors (see below), whose sum is σ = 2930928. Its totient is φ = 355680.

The previous prime is 1157987. The next prime is 1158007. The reversal of 1157988 is 8897511.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1157987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1743 + ... + 2313.

2^1157988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1157988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1465464).

1157988 is an abundant number, since it is smaller than the sum of its proper divisors (1772940).

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

1157988 is a wasteful number, since it uses less digits than its factorization.

1157988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 589 counting only the distinct ones).

The product of its digits is 20160, while the sum is 39.

The square root of 1157988 is about 1076.0985085019. The cubic root of 1157988 is about 105.0109739097.

1157988 divided by its sum of digits (39) gives a palindrome (29692).

It can be divided in two parts, 1157 and 988, that added together give a triangular number (2145 = T₆₅).

The spelling of 1157988 in words is "one million, one hundred fifty-seven thousand, nine hundred eighty-eight".