39998109 has 16 divisors (see below), whose sum is σ = 54065088. Its totient is φ = 26301312.

The previous prime is 39998071. The next prime is 39998111. The reversal of 39998109 is 90189993.

It is not a de Polignac number, because 39998109 - 2⁹ = 39997597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39998009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126019 + ... + 126335.

It is an arithmetic number, because the mean of its divisors is an integer number (3379068).

Almost surely, 2^39998109 is an apocalyptic number.

It is an amenable number.

39998109 is a deficient number, since it is larger than the sum of its proper divisors (14066979).

39998109 is a wasteful number, since it uses less digits than its factorization.

39998109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 39998109 is about 6324.4058218935. The cubic root of 39998109 is about 341.9897999762.

The spelling of 39998109 in words is "thirty-nine million, nine hundred ninety-eight thousand, one hundred nine".