1155400520 has 16 divisors (see below), whose sum is σ = 2599651260. Its totient is φ = 462160192.

The previous prime is 1155400457. The next prime is 1155400531. The reversal of 1155400520 is 250045511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1122384004 + 33016516 = 33502^2 + 5746^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14442467 + ... + 14442546.

Almost surely, 2^1155400520 is an apocalyptic number.

1155400520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155400520 is an abundant number, since it is smaller than the sum of its proper divisors (1444250740).

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

1155400520 is a wasteful number, since it uses less digits than its factorization.

1155400520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28885024 (or 28885020 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1155400520 is about 33991.1829744126. The cubic root of 1155400520 is about 1049.3270124357.

The spelling of 1155400520 in words is "one billion, one hundred fifty-five million, four hundred thousand, five hundred twenty".