29969721 has 12 divisors (see below), whose sum is σ = 43350372. Its totient is φ = 19951776.

The previous prime is 29969717. The next prime is 29969743. The reversal of 29969721 is 12796992.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 19316025 = 3264^2 + 4395^2 .

It is not a de Polignac number, because 29969721 - 2² = 29969717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29969701) 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 in 11 ways as a sum of consecutive naturals, for example, 5995 + ... + 9791.

It is an arithmetic number, because the mean of its divisors is an integer number (3612531).

Almost surely, 2^29969721 is an apocalyptic number.

It is an amenable number.

29969721 is a deficient number, since it is larger than the sum of its proper divisors (13380651).

29969721 is a wasteful number, since it uses less digits than its factorization.

29969721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4680 (or 4677 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 29969721 is about 5474.4607953661. The cubic root of 29969721 is about 310.6186777468.

The spelling of 29969721 in words is "twenty-nine million, nine hundred sixty-nine thousand, seven hundred twenty-one".