40139 has 8 divisors (see below), whose sum is σ = 45360. Its totient is φ = 35200.

The previous prime is 40129. The next prime is 40151. The reversal of 40139 is 93104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40139 - 2⁴ = 40123 is a prime.

It is a super-2 number, since 2×40139² = 3222278642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407 + ... + 495.

It is an arithmetic number, because the mean of its divisors is an integer number (5670).

2⁴⁰¹³⁹ is an apocalyptic number.

40139 is a deficient number, since it is larger than the sum of its proper divisors (5221).

40139 is a wasteful number, since it uses less digits than its factorization.

40139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 40139 is about 200.3471986328. The cubic root of 40139 is about 34.2390875780.

The spelling of 40139 in words is "forty thousand, one hundred thirty-nine".