40043440 has 40 divisors (see below), whose sum is σ = 93453840. Its totient is φ = 15956736.

The previous prime is 40043417. The next prime is 40043467. The reversal of 40043440 is 4434004.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24571 + ... + 26149.

It is an arithmetic number, because the mean of its divisors is an integer number (2336346).

Almost surely, 2^40043440 is an apocalyptic number.

40043440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40043440 is an abundant number, since it is smaller than the sum of its proper divisors (53410400).

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

40043440 is a wasteful number, since it uses less digits than its factorization.

40043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909 (or 1903 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 40043440 is about 6327.9886219872. The cubic root of 40043440 is about 342.1189468045.

Adding to 40043440 its reverse (4434004), we get a palindrome (44477444).

The spelling of 40043440 in words is "forty million, forty-three thousand, four hundred forty".