142979139 has 18 divisors (see below), whose sum is σ = 209713140. Its totient is φ = 93870216.

The previous prime is 142979131. The next prime is 142979143. The reversal of 142979139 is 931979241.

It is not a de Polignac number, because 142979139 - 2³ = 142979131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 142979094 and 142979103.

It is not an unprimeable number, because it can be changed into a prime (142979131) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 38632 + ... + 42170.

It is an arithmetic number, because the mean of its divisors is an integer number (11650730).

Almost surely, 2^142979139 is an apocalyptic number.

142979139 is a deficient number, since it is larger than the sum of its proper divisors (66734001).

142979139 is an equidigital number, since it uses as much as digits as its factorization.

142979139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679 (or 3609 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 142979139 is about 11957.3884690596. The cubic root of 142979139 is about 522.9067232964.

It can be divided in two parts, 14297 and 9139, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 142979139 in words is "one hundred forty-two million, nine hundred seventy-nine thousand, one hundred thirty-nine".