1155465820 has 24 divisors (see below), whose sum is σ = 2427834528. Its totient is φ = 461928000.

The previous prime is 1155465797. The next prime is 1155465823. The reversal of 1155465820 is 285645511.

It is a super-2 number, since 2×1155465820² = 2670202522376544800, 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 1155465820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155465823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22825 + ... + 53215.

It is an arithmetic number, because the mean of its divisors is an integer number (101159772).

Almost surely, 2^1155465820 is an apocalyptic number.

1155465820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155465820 is an abundant number, since it is smaller than the sum of its proper divisors (1272368708).

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

1155465820 is a wasteful number, since it uses less digits than its factorization.

1155465820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32301 (or 32299 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 1155465820 is about 33992.1435040511. The cubic root of 1155465820 is about 1049.3467804042.

The spelling of 1155465820 in words is "one billion, one hundred fifty-five million, four hundred sixty-five thousand, eight hundred twenty".