40538040 has 32 divisors (see below), whose sum is σ = 121614480. Its totient is φ = 10810112.

The previous prime is 40538023. The next prime is 40538041. The reversal of 40538040 is 4083504.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 40538040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40538041) 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, 168789 + ... + 169028.

Almost surely, 2^40538040 is an apocalyptic number.

40538040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40538040 is an abundant number, since it is smaller than the sum of its proper divisors (81076440).

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

40538040 is a wasteful number, since it uses less digits than its factorization.

40538040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337831 (or 337827 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 40538040 is about 6366.9490338780. The cubic root of 40538040 is about 343.5217574662.

The spelling of 40538040 in words is "forty million, five hundred thirty-eight thousand, forty".