4000000040 has 32 divisors (see below), whose sum is σ = 9529413480. Its totient is φ = 1505882112.

The previous prime is 4000000019. The next prime is 4000000063. The reversal of 4000000040 is 400000004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3888021316 + 111978724 = 62354^2 + 10582^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

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

It is a junction number, because it is equal to n+sod(n) for n = 3999999964 and 4000000027.

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, 2940497 + ... + 2941856.

Almost surely, 2^4000000040 is an apocalyptic number.

4000000040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4000000040 is an abundant number, since it is smaller than the sum of its proper divisors (5529413440).

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

4000000040 is a wasteful number, since it uses less digits than its factorization.

4000000040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882381 (or 5882377 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 4000000040 is about 63245.5535195954. The cubic root of 4000000040 is about 1587.4010572595.

Adding to 4000000040 its reverse (400000004), we get a palindrome (4400000044).

It can be divided in two parts, 40000000 and 40, that multiplied together give a 4-th power (1600000000 = 200⁴).

The spelling of 4000000040 in words is "four billion, forty", and thus it is an aban number and an eban number.