29390921 has 4 divisors (see below), whose sum is σ = 33589632. Its totient is φ = 25192212.

The previous prime is 29390897. The next prime is 29390927. The reversal of 29390921 is 12909392.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 29390921 - 2¹⁰ = 29389897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (29390927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2099345 + ... + 2099358.

It is an arithmetic number, because the mean of its divisors is an integer number (8397408).

Almost surely, 2^29390921 is an apocalyptic number.

It is an amenable number.

29390921 is a deficient number, since it is larger than the sum of its proper divisors (4198711).

29390921 is an equidigital number, since it uses as much as digits as its factorization.

29390921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198710.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 29390921 is about 5421.3394101458. The cubic root of 29390921 is about 308.6060234480.

The spelling of 29390921 in words is "twenty-nine million, three hundred ninety thousand, nine hundred twenty-one".