40018400 has 36 divisors (see below), whose sum is σ = 97696872. Its totient is φ = 16007040.

The previous prime is 40018393. The next prime is 40018403. The reversal of 40018400 is 481004.

It is a happy number.

It is a hoax number, since the sum of its digits (17) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40018403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24212 + ... + 25811.

It is an arithmetic number, because the mean of its divisors is an integer number (2713802).

Almost surely, 2^40018400 is an apocalyptic number.

40018400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40018400 is an abundant number, since it is smaller than the sum of its proper divisors (57678472).

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

40018400 is a wasteful number, since it uses less digits than its factorization.

40018400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50043 (or 50030 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 40018400 is about 6326.0098008144. The cubic root of 40018400 is about 342.0476205591.

Adding to 40018400 its reverse (481004), we get a palindrome (40499404).

The spelling of 40018400 in words is "forty million, eighteen thousand, four hundred".