29979839 has 2 divisors, whose sum is σ = 29979840. Its totient is φ = 29979838.

The previous prime is 29979827. The next prime is 29979889. The reversal of 29979839 is 93897992.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29979839 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29979809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14989919 + 14989920.

It is an arithmetic number, because the mean of its divisors is an integer number (14989920).

Almost surely, 2^29979839 is an apocalyptic number.

29979839 is a deficient number, since it is larger than the sum of its proper divisors (1).

29979839 is an equidigital number, since it uses as much as digits as its factorization.

29979839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 56.

The square root of 29979839 is about 5475.3848266583. The cubic root of 29979839 is about 310.6536295366.

It can be divided in two parts, 2997983 and 9, that added together give a palindrome (2997992).

The spelling of 29979839 in words is "twenty-nine million, nine hundred seventy-nine thousand, eight hundred thirty-nine".