40438240 has 48 divisors (see below), whose sum is σ = 101161872. Its totient is φ = 15222784.

The previous prime is 40438199. The next prime is 40438241. The reversal of 40438240 is 4283404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40438241) 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, 4714 + ... + 10153.

It is an arithmetic number, because the mean of its divisors is an integer number (2107539).

Almost surely, 2^40438240 is an apocalyptic number.

40438240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40438240 is an abundant number, since it is smaller than the sum of its proper divisors (60723632).

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

40438240 is a wasteful number, since it uses less digits than its factorization.

40438240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14899 (or 14891 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 40438240 is about 6359.1068555262. The cubic root of 40438240 is about 343.2396221029.

The spelling of 40438240 in words is "forty million, four hundred thirty-eight thousand, two hundred forty".