29991427 has 2 divisors, whose sum is σ = 29991428. Its totient is φ = 29991426.

The previous prime is 29991419. The next prime is 29991433. The reversal of 29991427 is 72419992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 29991427 - 2³ = 29991419 is a prime.

It is not a weakly prime, because it can be changed into another prime (29991457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995713 + 14995714.

It is an arithmetic number, because the mean of its divisors is an integer number (14995714).

Almost surely, 2^29991427 is an apocalyptic number.

29991427 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991427 is an equidigital number, since it uses as much as digits as its factorization.

29991427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 29991427 is about 5476.4429148855. The cubic root of 29991427 is about 310.6936496597.

The spelling of 29991427 in words is "twenty-nine million, nine hundred ninety-one thousand, four hundred twenty-seven".