1155389472 has 36 divisors (see below), whose sum is σ = 3285639630. Its totient is φ = 385129728.

The previous prime is 1155389467. The next prime is 1155389483. The reversal of 1155389472 is 2749835511.

1155389472 is a `hidden beast` number, since 1 + 1 + 553 + 8 + 94 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 797271696 + 358117776 = 28236^2 + 18924^2 .

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

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, 2005597 + ... + 2006172.

Almost surely, 2^1155389472 is an apocalyptic number.

1155389472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1155389472 is an abundant number, since it is smaller than the sum of its proper divisors (2130250158).

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

1155389472 is a wasteful number, since it uses less digits than its factorization.

1155389472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4011785 (or 4011774 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 1155389472 is about 33991.0204612924. The cubic root of 1155389472 is about 1049.3236678519.

It can be divided in two parts, 11553 and 89472, that added together give a triangular number (101025 = T₄₄₉).

The spelling of 1155389472 in words is "one billion, one hundred fifty-five million, three hundred eighty-nine thousand, four hundred seventy-two".