29923139 has 2 divisors, whose sum is σ = 29923140. Its totient is φ = 29923138.

The previous prime is 29923133. The next prime is 29923147. The reversal of 29923139 is 93132992.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29923139 is a prime.

It is a super-2 number, since 2×29923139² = 1790788495226642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (29923133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14961569 + 14961570.

It is an arithmetic number, because the mean of its divisors is an integer number (14961570).

Almost surely, 2^29923139 is an apocalyptic number.

29923139 is a deficient number, since it is larger than the sum of its proper divisors (1).

29923139 is an equidigital number, since it uses as much as digits as its factorization.

29923139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The square root of 29923139 is about 5470.2046579630. The cubic root of 29923139 is about 310.4576625424.

The spelling of 29923139 in words is "twenty-nine million, nine hundred twenty-three thousand, one hundred thirty-nine".