40138109 has 4 divisors (see below), whose sum is σ = 43787040. Its totient is φ = 36489180.

The previous prime is 40138103. The next prime is 40138121. The reversal of 40138109 is 90183104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40138109 - 2⁴ = 40138093 is a prime.

It is a super-2 number, since 2×40138109² = 3222135588191762, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40138103) 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, 1824449 + ... + 1824470.

It is an arithmetic number, because the mean of its divisors is an integer number (10946760).

Almost surely, 2^40138109 is an apocalyptic number.

It is an amenable number.

40138109 is a deficient number, since it is larger than the sum of its proper divisors (3648931).

40138109 is a wasteful number, since it uses less digits than its factorization.

40138109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648930.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 40138109 is about 6335.4643870832. The cubic root of 40138109 is about 342.3883423122.

The spelling of 40138109 in words is "forty million, one hundred thirty-eight thousand, one hundred nine".