29138909 has 4 divisors (see below), whose sum is σ = 29307516. Its totient is φ = 28970304.

The previous prime is 29138891. The next prime is 29138929. The reversal of 29138909 is 90983192.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14100025 + 15038884 = 3755^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 29138909 - 2⁸ = 29138653 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 (29138929) 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, 84044 + ... + 84389.

It is an arithmetic number, because the mean of its divisors is an integer number (7326879).

Almost surely, 2^29138909 is an apocalyptic number.

It is an amenable number.

29138909 is a deficient number, since it is larger than the sum of its proper divisors (168607).

29138909 is a wasteful number, since it uses less digits than its factorization.

29138909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168606.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 29138909 is about 5398.0467763812. The cubic root of 29138909 is about 307.7214444732.

The spelling of 29138909 in words is "twenty-nine million, one hundred thirty-eight thousand, nine hundred nine".