29972639 has 2 divisors, whose sum is σ = 29972640. Its totient is φ = 29972638.

The previous prime is 29972623. The next prime is 29972647. The reversal of 29972639 is 93627992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 29972639 - 2⁴ = 29972623 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 29972593 and 29972602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29972539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14986319 + 14986320.

It is an arithmetic number, because the mean of its divisors is an integer number (14986320).

Almost surely, 2^29972639 is an apocalyptic number.

29972639 is a deficient number, since it is larger than the sum of its proper divisors (1).

29972639 is an equidigital number, since it uses as much as digits as its factorization.

29972639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 47.

The square root of 29972639 is about 5474.7272991447. The cubic root of 29972639 is about 310.6287585423.

The spelling of 29972639 in words is "twenty-nine million, nine hundred seventy-two thousand, six hundred thirty-nine".