1155123400 has 24 divisors (see below), whose sum is σ = 2685662370. Its totient is φ = 462049280.

The previous prime is 1155123383. The next prime is 1155123413. The reversal of 1155123400 is 43215511.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1115960836 + 39162564 = 33406^2 + 6258^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2887609 + ... + 2888008.

Almost surely, 2^1155123400 is an apocalyptic number.

1155123400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155123400 is an abundant number, since it is smaller than the sum of its proper divisors (1530538970).

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

1155123400 is a wasteful number, since it uses less digits than its factorization.

1155123400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5775633 (or 5775624 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1155123400 is about 33987.1063787431. The cubic root of 1155123400 is about 1049.2431128851.

Adding to 1155123400 its reverse (43215511), we get a palindrome (1198338911).

The spelling of 1155123400 in words is "one billion, one hundred fifty-five million, one hundred twenty-three thousand, four hundred".