40138868 has 60 divisors (see below), whose sum is σ = 92440992. Its totient is φ = 14815440.

The previous prime is 40138867. The next prime is 40138919. The reversal of 40138868 is 86883104.

It is a super-2 number, since 2×40138868² = 3222257448642848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40138867) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2112563 + ... + 2112581.

Almost surely, 2^40138868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40138868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46220496).

40138868 is an abundant number, since it is smaller than the sum of its proper divisors (52302124).

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

40138868 is an equidigital number, since it uses as much as digits as its factorization.

40138868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 40138868 is about 6335.5242876971. The cubic root of 40138868 is about 342.3905004534.

The spelling of 40138868 in words is "forty million, one hundred thirty-eight thousand, eight hundred sixty-eight".