40040400 has 120 divisors (see below), whose sum is σ = 130603744. Its totient is φ = 10483200.

The previous prime is 40040393. The next prime is 40040411. The reversal of 40040400 is 404004.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72927 + ... + 73473.

Almost surely, 2^40040400 is an apocalyptic number.

40040400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40040400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65301872).

40040400 is an abundant number, since it is smaller than the sum of its proper divisors (90563344).

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

40040400 is a wasteful number, since it uses less digits than its factorization.

40040400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 40040400 is about 6327.7484147207. The cubic root of 40040400 is about 342.1102889742.

Adding to 40040400 its reverse (404004), we get a palindrome (40444404).

The spelling of 40040400 in words is "forty million, forty thousand, four hundred".