139029979 has 8 divisors (see below), whose sum is σ = 155768688. Its totient is φ = 122974560.

The previous prime is 139029977. The next prime is 139029991. The reversal of 139029979 is 979920931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139029979 - 2¹ = 139029977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139029977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170392 + ... + 171205.

It is an arithmetic number, because the mean of its divisors is an integer number (19471086).

Almost surely, 2^139029979 is an apocalyptic number.

139029979 is a deficient number, since it is larger than the sum of its proper divisors (16738709).

139029979 is a wasteful number, since it uses less digits than its factorization.

139029979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341645.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 139029979 is about 11791.0974468028. The cubic root of 139029979 is about 518.0473848912.

The spelling of 139029979 in words is "one hundred thirty-nine million, twenty-nine thousand, nine hundred seventy-nine".