1142721972 has 96 divisors (see below), whose sum is σ = 3533107200. Its totient is φ = 312291936.

The previous prime is 1142721941. The next prime is 1142721989. The reversal of 1142721972 is 2791272411.

1142721972 is a `hidden beast` number, since 11 + 427 + 219 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15472 + ... + 50247.

It is an arithmetic number, because the mean of its divisors is an integer number (36803200).

Almost surely, 2^1142721972 is an apocalyptic number.

1142721972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1142721972 is an abundant number, since it is smaller than the sum of its proper divisors (2390385228).

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

1142721972 is a wasteful number, since it uses less digits than its factorization.

1142721972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65762 (or 65754 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 1142721972 is about 33804.1709260854. The cubic root of 1142721972 is about 1045.4746962335.

The spelling of 1142721972 in words is "one billion, one hundred forty-two million, seven hundred twenty-one thousand, nine hundred seventy-two".