38978109 has 12 divisors (see below), whose sum is σ = 56444700. Its totient is φ = 25919424.

The previous prime is 38978099. The next prime is 38978113. The reversal of 38978109 is 90187983.

It can be written as a sum of positive squares in 2 ways, for example, as 20958084 + 18020025 = 4578^2 + 4245^2 .

It is not a de Polignac number, because 38978109 - 2¹¹ = 38976061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38978119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1614 + ... + 8975.

It is an arithmetic number, because the mean of its divisors is an integer number (4703725).

Almost surely, 2^38978109 is an apocalyptic number.

It is an amenable number.

38978109 is a deficient number, since it is larger than the sum of its proper divisors (17466591).

38978109 is a wasteful number, since it uses less digits than its factorization.

38978109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11004 (or 11001 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 38978109 is about 6243.2450696733. The cubic root of 38978109 is about 339.0576819903.

The spelling of 38978109 in words is "thirty-eight million, nine hundred seventy-eight thousand, one hundred nine".