1155641420 has 12 divisors (see below), whose sum is σ = 2426847024. Its totient is φ = 462256560.

The previous prime is 1155641407. The next prime is 1155641423. The reversal of 1155641420 is 241465511.

It is not an unprimeable number, because it can be changed into a prime (1155641423) 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, 28891016 + ... + 28891055.

It is an arithmetic number, because the mean of its divisors is an integer number (202237252).

Almost surely, 2^1155641420 is an apocalyptic number.

1155641420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155641420 is an abundant number, since it is smaller than the sum of its proper divisors (1271205604).

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

1155641420 is a wasteful number, since it uses less digits than its factorization.

1155641420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57782080 (or 57782078 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1155641420 is about 33994.7263557158. The cubic root of 1155641420 is about 1049.3999352899.

The spelling of 1155641420 in words is "one billion, one hundred fifty-five million, six hundred forty-one thousand, four hundred twenty".