1155523420 has 24 divisors (see below), whose sum is σ = 2427851664. Its totient is φ = 461970816.

The previous prime is 1155523417. The next prime is 1155523471. The reversal of 1155523420 is 243255511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27792 + ... + 55528.

It is an arithmetic number, because the mean of its divisors is an integer number (101160486).

Almost surely, 2^1155523420 is an apocalyptic number.

1155523420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155523420 is an abundant number, since it is smaller than the sum of its proper divisors (1272328244).

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

1155523420 is a wasteful number, since it uses less digits than its factorization.

1155523420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29829 (or 29827 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1155523420 is about 33992.9907480939. The cubic root of 1155523420 is about 1049.3642167689.

Adding to 1155523420 its reverse (243255511), we get a palindrome (1398778931).

The spelling of 1155523420 in words is "one billion, one hundred fifty-five million, five hundred twenty-three thousand, four hundred twenty".