1142555868 has 42 divisors (see below), whose sum is σ = 2997845424. Its totient is φ = 380850984.

The previous prime is 1142555857. The next prime is 1142555879. The reversal of 1142555868 is 8685552411.

1142555868 is a `hidden beast` number, since 1 + 14 + 2 + 55 + 586 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1142555857) and next prime (1142555879).

It is a congruent number.

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 13 ways as a sum of consecutive naturals, for example, 192996 + ... + 198827.

It is an arithmetic number, because the mean of its divisors is an integer number (71377272).

Almost surely, 2^1142555868 is an apocalyptic number.

1142555868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1142555868 is an abundant number, since it is smaller than the sum of its proper divisors (1855289556).

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

1142555868 is an equidigital number, since it uses as much as digits as its factorization.

1142555868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391845 (or 391828 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The square root of 1142555868 is about 33801.7139802111. The cubic root of 1142555868 is about 1045.4240376749.

The spelling of 1142555868 in words is "one billion, one hundred forty-two million, five hundred fifty-five thousand, eight hundred sixty-eight".