1155522420 has 72 divisors (see below), whose sum is σ = 3774714216. Its totient is φ = 284435712.

The previous prime is 1155522409. The next prime is 1155522443. The reversal of 1155522420 is 242255511.

1155522420 is a `hidden beast` number, since 115 + 5 + 522 + 4 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1425636 + 1154096784 = 1194^2 + 33972^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 244567 + ... + 249246.

Almost surely, 2^1155522420 is an apocalyptic number.

1155522420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155522420 is an abundant number, since it is smaller than the sum of its proper divisors (2619191796).

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

1155522420 is a wasteful number, since it uses less digits than its factorization.

1155522420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493841 (or 493836 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1155522420 is about 33992.9760391761. The cubic root of 1155522420 is about 1049.3639140591.

Adding to 1155522420 its reverse (242255511), we get a palindrome (1397777931).

The spelling of 1155522420 in words is "one billion, one hundred fifty-five million, five hundred twenty-two thousand, four hundred twenty".