29872391 has 2 divisors, whose sum is σ = 29872392. Its totient is φ = 29872390.

The previous prime is 29872379. The next prime is 29872393. The reversal of 29872391 is 19327892.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29872391 is a prime.

Together with 29872393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29872393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14936195 + 14936196.

It is an arithmetic number, because the mean of its divisors is an integer number (14936196).

Almost surely, 2^29872391 is an apocalyptic number.

29872391 is a deficient number, since it is larger than the sum of its proper divisors (1).

29872391 is an equidigital number, since it uses as much as digits as its factorization.

29872391 is an odious number, because the sum of its binary digits is odd.

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

The square root of 29872391 is about 5465.5641062931. The cubic root of 29872391 is about 310.2820568520.

The spelling of 29872391 in words is "twenty-nine million, eight hundred seventy-two thousand, three hundred ninety-one".