38902909 has 4 divisors (see below), whose sum is σ = 38917404. Its totient is φ = 38888416.

The previous prime is 38902883. The next prime is 38902921. The reversal of 38902909 is 90920983.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90920983 = 47 ⋅1934489.

It can be written as a sum of positive squares in 2 ways, for example, as 22297284 + 16605625 = 4722^2 + 4075^2 .

It is a cyclic number.

It is not a de Polignac number, because 38902909 - 2¹⁵ = 38870141 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38902979) 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, 1912 + ... + 9025.

It is an arithmetic number, because the mean of its divisors is an integer number (9729351).

Almost surely, 2^38902909 is an apocalyptic number.

It is an amenable number.

38902909 is a deficient number, since it is larger than the sum of its proper divisors (14495).

38902909 is a wasteful number, since it uses less digits than its factorization.

38902909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14494.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 38902909 is about 6237.2196530185. The cubic root of 38902909 is about 338.8394949699.

The spelling of 38902909 in words is "thirty-eight million, nine hundred two thousand, nine hundred nine".