40138028 has 36 divisors (see below), whose sum is σ = 81693360. Its totient is φ = 16903296.

The previous prime is 40138019. The next prime is 40138031. The reversal of 40138028 is 82083104.

It is a super-2 number, since 2×40138028² = 3222122583457568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40137988 and 40138006.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149078 + ... + 149346.

It is an arithmetic number, because the mean of its divisors is an integer number (2269260).

Almost surely, 2^40138028 is an apocalyptic number.

It is an amenable number.

40138028 is an abundant number, since it is smaller than the sum of its proper divisors (41555332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40138028 is a wasteful number, since it uses less digits than its factorization.

40138028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 40138028 is about 6335.4579944942. The cubic root of 40138028 is about 342.3881119952.

The spelling of 40138028 in words is "forty million, one hundred thirty-eight thousand, twenty-eight".