29920405 has 8 divisors (see below), whose sum is σ = 35945784. Its totient is φ = 23908800.

The previous prime is 29920403. The next prime is 29920411. The reversal of 29920405 is 50402992.

It can be written as a sum of positive squares in 4 ways, for example, as 3305124 + 26615281 = 1818^2 + 5159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 29920405 - 2¹ = 29920403 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 (29920403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2175 + ... + 8035.

It is an arithmetic number, because the mean of its divisors is an integer number (4493223).

Almost surely, 2^29920405 is an apocalyptic number.

It is an amenable number.

29920405 is a deficient number, since it is larger than the sum of its proper divisors (6025379).

29920405 is a wasteful number, since it uses less digits than its factorization.

29920405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 29920405 is about 5469.9547530121. The cubic root of 29920405 is about 310.4482070159.

The spelling of 29920405 in words is "twenty-nine million, nine hundred twenty thousand, four hundred five".