1142855872 has 56 divisors (see below), whose sum is σ = 2423946384. Its totient is φ = 532733952.

The previous prime is 1142855863. The next prime is 1142855887. The reversal of 1142855872 is 2785582411.

It is a super-2 number, since 2×1142855872² = 2612239088329760768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111508 + ... + 121324.

Almost surely, 2^1142855872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1142855872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1211973192).

1142855872 is an abundant number, since it is smaller than the sum of its proper divisors (1281090512).

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

1142855872 is a wasteful number, since it uses less digits than its factorization.

1142855872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9953 (or 9943 counting only the distinct ones).

The product of its digits is 179200, while the sum is 43.

The square root of 1142855872 is about 33806.1513929048. The cubic root of 1142855872 is about 1045.5155296114.

The spelling of 1142855872 in words is "one billion, one hundred forty-two million, eight hundred fifty-five thousand, eight hundred seventy-two".