29872139 has 4 divisors (see below), whose sum is σ = 32587800. Its totient is φ = 27156480.

The previous prime is 29872121. The next prime is 29872177. The reversal of 29872139 is 93127892.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 29872139 - 2²⁰ = 28823563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29872096 and 29872105.

It is not an unprimeable number, because it can be changed into a prime (29872109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357814 + ... + 1357835.

It is an arithmetic number, because the mean of its divisors is an integer number (8146950).

Almost surely, 2^29872139 is an apocalyptic number.

29872139 is a deficient number, since it is larger than the sum of its proper divisors (2715661).

29872139 is a wasteful number, since it uses less digits than its factorization.

29872139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715660.

The product of its digits is 54432, while the sum is 41.

The square root of 29872139 is about 5465.5410528144. The cubic root of 29872139 is about 310.2811843484.

The spelling of 29872139 in words is "twenty-nine million, eight hundred seventy-two thousand, one hundred thirty-nine".