29440421 has 4 divisors (see below), whose sum is σ = 30390144. Its totient is φ = 28490700.

The previous prime is 29440409. The next prime is 29440427. The reversal of 29440421 is 12404492.

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 29440421 - 2⁶ = 29440357 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 (29440427) 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, 474815 + ... + 474876.

It is an arithmetic number, because the mean of its divisors is an integer number (7597536).

Almost surely, 2^29440421 is an apocalyptic number.

It is an amenable number.

29440421 is a deficient number, since it is larger than the sum of its proper divisors (949723).

29440421 is an equidigital number, since it uses as much as digits as its factorization.

29440421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949722.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 29440421 is about 5425.9027820262. The cubic root of 29440421 is about 308.7791770358.

The spelling of 29440421 in words is "twenty-nine million, four hundred forty thousand, four hundred twenty-one".