29818809 has 24 divisors (see below), whose sum is σ = 45805760. Its totient is φ = 18639072.

The previous prime is 29818801. The next prime is 29818837. The reversal of 29818809 is 90881892.

It is not a de Polignac number, because 29818809 - 2³ = 29818801 is a prime.

It is a super-2 number, since 2×29818809² = 1778322740356962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29818801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16767 + ... + 18459.

Almost surely, 2^29818809 is an apocalyptic number.

It is an amenable number.

29818809 is a deficient number, since it is larger than the sum of its proper divisors (15986951).

29818809 is a wasteful number, since it uses less digits than its factorization.

29818809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 29818809 is about 5460.6601249300. The cubic root of 29818809 is about 310.0964285520.

The spelling of 29818809 in words is "twenty-nine million, eight hundred eighteen thousand, eight hundred nine".