40000018 has 8 divisors (see below), whose sum is σ = 60983820. Its totient is φ = 19672080.

The previous prime is 40000003. The next prime is 40000021. The reversal of 40000018 is 81000004.

It can be written as a sum of positive squares in 2 ways, for example, as 26801329 + 13198689 = 5177^2 + 3633^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

40000018 is a modest number, since divided by 18 gives 4 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 39999962 and 40000007.

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, 163813 + ... + 164056.

Almost surely, 2^40000018 is an apocalyptic number.

40000018 is a deficient number, since it is larger than the sum of its proper divisors (20983802).

40000018 is a wasteful number, since it uses less digits than its factorization.

40000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327932.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 40000018 is about 6324.5567433615. The cubic root of 40000018 is about 341.9952406346.

The spelling of 40000018 in words is "forty million, eighteen", and thus it is an aban number and an uban number.