40043840 has 84 divisors (see below), whose sum is σ = 101527356. Its totient is φ = 15040512.

The previous prime is 40043827. The next prime is 40043863. The reversal of 40043840 is 4834004.

It can be written as a sum of positive squares in 6 ways, for example, as 256 + 40043584 = 16^2 + 6328^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92264 + ... + 92696.

It is an arithmetic number, because the mean of its divisors is an integer number (1208659).

Almost surely, 2^40043840 is an apocalyptic number.

40043840 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 40043840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50763678).

40043840 is an abundant number, since it is smaller than the sum of its proper divisors (61483516).

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

40043840 is a wasteful number, since it uses less digits than its factorization.

40043840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 40043840 is about 6328.0202275277. The cubic root of 40043840 is about 342.1200859601.

Adding to 40043840 its reverse (4834004), we get a palindrome (44877844).

The spelling of 40043840 in words is "forty million, forty-three thousand, eight hundred forty".