40138236 has 36 divisors (see below), whose sum is σ = 101653552. Its totient is φ = 13353984.

The previous prime is 40138201. The next prime is 40138237. The reversal of 40138236 is 63283104.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×40138236² = 3222155978383392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40138237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34236 + ... + 35388.

Almost surely, 2^40138236 is an apocalyptic number.

It is an amenable number.

40138236 is an abundant number, since it is smaller than the sum of its proper divisors (61515316).

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

40138236 is a wasteful number, since it uses less digits than its factorization.

40138236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40138236 is about 6335.4744100186. The cubic root of 40138236 is about 342.3887034260.

The spelling of 40138236 in words is "forty million, one hundred thirty-eight thousand, two hundred thirty-six".