1155803816 has 16 divisors (see below), whose sum is σ = 2241861300. Its totient is φ = 557974144.

The previous prime is 1155803777. The next prime is 1155803819. The reversal of 1155803816 is 6183085511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1020546916 + 135256900 = 31946^2 + 11630^2 .

It is a super-2 number, since 2×1155803816² = 2671764922160323712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1155803816.

It is not an unprimeable number, because it can be changed into a prime (1155803819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2490725 + ... + 2491188.

Almost surely, 2^1155803816 is an apocalyptic number.

It is an amenable number.

1155803816 is a deficient number, since it is larger than the sum of its proper divisors (1086057484).

1155803816 is a wasteful number, since it uses less digits than its factorization.

1155803816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981948 (or 4981944 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 1155803816 is about 33997.1148187607. The cubic root of 1155803816 is about 1049.4490884750.

The spelling of 1155803816 in words is "one billion, one hundred fifty-five million, eight hundred three thousand, eight hundred sixteen".