40013888 has 28 divisors (see below), whose sum is σ = 79606140. Its totient is φ = 19955712.

The previous prime is 40013863. The next prime is 40013917. The reversal of 40013888 is 88831004.

It can be written as a sum of positive squares in 2 ways, for example, as 5345344 + 34668544 = 2312^2 + 5888^2 .

It is a super-2 number, since 2×40013888² = 3202222465753088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42608 + ... + 43536.

Almost surely, 2^40013888 is an apocalyptic number.

It is an amenable number.

40013888 is a deficient number, since it is larger than the sum of its proper divisors (39592252).

40013888 is an equidigital number, since it uses as much as digits as its factorization.

40013888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 40013888 is about 6325.6531678555. The cubic root of 40013888 is about 342.0347649987.

The spelling of 40013888 in words is "forty million, thirteen thousand, eight hundred eighty-eight".