29949921 has 6 divisors (see below), whose sum is σ = 43261010. Its totient is φ = 19966608.

The previous prime is 29949919. The next prime is 29949943. The reversal of 29949921 is 12994992.

It can be written as a sum of positive squares in only one way, i.e., 17943696 + 12006225 = 4236^2 + 3465^2 .

It is not a de Polignac number, because 29949921 - 2¹ = 29949919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29949961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1663876 + ... + 1663893.

Almost surely, 2^29949921 is an apocalyptic number.

It is an amenable number.

29949921 is a deficient number, since it is larger than the sum of its proper divisors (13311089).

29949921 is a wasteful number, since it uses less digits than its factorization.

29949921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327775 (or 3327772 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 29949921 is about 5472.6520993025. The cubic root of 29949921 is about 310.5502575265.

The spelling of 29949921 in words is "twenty-nine million, nine hundred forty-nine thousand, nine hundred twenty-one".