40438140 has 48 divisors (see below), whose sum is σ = 118153728. Its totient is φ = 10314304.

The previous prime is 40438081. The next prime is 40438141. The reversal of 40438140 is 4183404.

It is a self number, because there is not a number n which added to its sum of digits gives 40438140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40438141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13272 + ... + 16031.

It is an arithmetic number, because the mean of its divisors is an integer number (2461536).

Almost surely, 2^40438140 is an apocalyptic number.

It is an amenable number.

40438140 is an abundant number, since it is smaller than the sum of its proper divisors (77715588).

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

40438140 is a wasteful number, since it uses less digits than its factorization.

40438140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29338 (or 29336 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 40438140 is about 6359.0989927819. The cubic root of 40438140 is about 343.2393391694.

The spelling of 40438140 in words is "forty million, four hundred thirty-eight thousand, one hundred forty".