29407421 has 18 divisors (see below), whose sum is σ = 32724090. Its totient is φ = 26391456.

The previous prime is 29407403. The next prime is 29407451. The reversal of 29407421 is 12470492.

It can be written as a sum of positive squares in 3 ways, for example, as 10310521 + 19096900 = 3211^2 + 4370^2 .

It is a de Polignac number, because none of the positive numbers 2^k-29407421 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29407451) 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 17 ways as a sum of consecutive naturals, for example, 554831 + ... + 554883.

It is an arithmetic number, because the mean of its divisors is an integer number (1818005).

Almost surely, 2^29407421 is an apocalyptic number.

It is an amenable number.

29407421 is a deficient number, since it is larger than the sum of its proper divisors (3316669).

29407421 is an equidigital number, since it uses as much as digits as its factorization.

29407421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 29407421 is about 5422.8609607844. The cubic root of 29407421 is about 308.6637628976.

Multiplying 29407421 by its sum of digits (29), we get a square (852815209 = 29203²).

29407421 divided by its sum of digits (29) gives a square (1014049 = 1007²).

The spelling of 29407421 in words is "twenty-nine million, four hundred seven thousand, four hundred twenty-one".