1142656220 has 24 divisors (see below), whose sum is σ = 2404780224. Its totient is φ = 456071616.

The previous prime is 1142656213. The next prime is 1142656271. The reversal of 1142656220 is 226562411.

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, 52439 + ... + 70958.

It is an arithmetic number, because the mean of its divisors is an integer number (100199176).

Almost surely, 2^1142656220 is an apocalyptic number.

1142656220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142656220 is an abundant number, since it is smaller than the sum of its proper divisors (1262124004).

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

1142656220 is a wasteful number, since it uses less digits than its factorization.

1142656220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123869 (or 123867 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1142656220 is about 33803.1983693851. The cubic root of 1142656220 is about 1045.4546437120.

The spelling of 1142656220 in words is "one billion, one hundred forty-two million, six hundred fifty-six thousand, two hundred twenty".