40280018 has 8 divisors (see below), whose sum is σ = 60513420. Its totient is φ = 20108880.

The previous prime is 40280003. The next prime is 40280027. The reversal of 40280018 is 81008204.

It can be written as a sum of positive squares in 2 ways, for example, as 39150049 + 1129969 = 6257^2 + 1063^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 40279975 and 40280002.

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, 13913 + ... + 16556.

Almost surely, 2^40280018 is an apocalyptic number.

40280018 is a deficient number, since it is larger than the sum of its proper divisors (20233402).

40280018 is a wasteful number, since it uses less digits than its factorization.

40280018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31132.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 40280018 is about 6346.6540791192. The cubic root of 40280018 is about 342.7913744053.

The spelling of 40280018 in words is "forty million, two hundred eighty thousand, eighteen".