1155440400 has 60 divisors (see below), whose sum is σ = 3701264592. Its totient is φ = 308117120.

The previous prime is 1155440387. The next prime is 1155440449. The reversal of 1155440400 is 40445511.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480234 + ... + 482633.

Almost surely, 2^1155440400 is an apocalyptic number.

1155440400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155440400 is an abundant number, since it is smaller than the sum of its proper divisors (2545824192).

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

1155440400 is a wasteful number, since it uses less digits than its factorization.

1155440400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962888 (or 962877 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1155440400 is about 33991.7695920645. The cubic root of 1155440400 is about 1049.3390852131.

Adding to 1155440400 its reverse (40445511), we get a palindrome (1195885911).

The spelling of 1155440400 in words is "one billion, one hundred fifty-five million, four hundred forty thousand, four hundred".