40003840 has 36 divisors (see below), whose sum is σ = 95824764. Its totient is φ = 16001024.

The previous prime is 40003819. The next prime is 40003883. The reversal of 40003840 is 4830004.

It can be written as a sum of positive squares in 2 ways, for example, as 19501056 + 20502784 = 4416^2 + 4528^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14347 + ... + 16906.

It is an arithmetic number, because the mean of its divisors is an integer number (2661799).

Almost surely, 2^40003840 is an apocalyptic number.

40003840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40003840 is an abundant number, since it is smaller than the sum of its proper divisors (55820924).

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

40003840 is an equidigital number, since it uses as much as digits as its factorization.

40003840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31274 (or 31260 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40003840 is about 6324.8588917066. The cubic root of 40003840 is about 342.0061328312.

Adding to 40003840 its reverse (4830004), we get a palindrome (44833844).

The spelling of 40003840 in words is "forty million, three thousand, eight hundred forty".