1142399979 has 12 divisors (see below), whose sum is σ = 1885866736. Its totient is φ = 652799952.

The previous prime is 1142399971. The next prime is 1142400031. The reversal of 1142399979 is 9799932411.

It is a happy number.

1142399979 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1142399979 - 2³ = 1142399971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1142399971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9066604 + ... + 9066729.

Almost surely, 2^1142399979 is an apocalyptic number.

1142399979 is a deficient number, since it is larger than the sum of its proper divisors (743466757).

1142399979 is a wasteful number, since it uses less digits than its factorization.

1142399979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18133346 (or 18133343 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 1142399979 is about 33799.4079681878. The cubic root of 1142399979 is about 1045.3764900306.

The spelling of 1142399979 in words is "one billion, one hundred forty-two million, three hundred ninety-nine thousand, nine hundred seventy-nine".