1123031988 has 36 divisors (see below), whose sum is σ = 3057143908. Its totient is φ = 345548160.

The previous prime is 1123031983. The next prime is 1123032049. The reversal of 1123031988 is 8891303211.

It can be written as a sum of positive squares in 2 ways, for example, as 363588624 + 759443364 = 19068^2 + 27558^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1123031988² = 2522401692142464288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123031983) 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, 1199353 + ... + 1200288.

Almost surely, 2^1123031988 is an apocalyptic number.

1123031988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1123031988 is an abundant number, since it is smaller than the sum of its proper divisors (1934111920).

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

1123031988 is a wasteful number, since it uses less digits than its factorization.

1123031988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399664 (or 2399659 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1123031988 is about 33511.6694302149. The cubic root of 1123031988 is about 1039.4350938514.

The spelling of 1123031988 in words is "one billion, one hundred twenty-three million, thirty-one thousand, nine hundred eighty-eight".