40138 has 16 divisors (see below), whose sum is σ = 71424. Its totient is φ = 16560.

The previous prime is 40129. The next prime is 40151. The reversal of 40138 is 83104.

40138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40138² = 3222118088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628 + ... + 688.

It is an arithmetic number, because the mean of its divisors is an integer number (4464).

2⁴⁰¹³⁸ is an apocalyptic number.

40138 is a deficient number, since it is larger than the sum of its proper divisors (31286).

40138 is a wasteful number, since it uses less digits than its factorization.

40138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 40138 is about 200.3447029497. The cubic root of 40138 is about 34.2388032379.

The spelling of 40138 in words is "forty thousand, one hundred thirty-eight".