40381018 has 16 divisors (see below), whose sum is σ = 65347560. Its totient is φ = 18643456.

The previous prime is 40380971. The next prime is 40381039. The reversal of 40381018 is 81018304.

It can be written as a sum of positive squares in 4 ways, for example, as 39980329 + 400689 = 6323^2 + 633^2 .

It is a super-2 number, since 2×40381018² = 3261253229432648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40380983 and 40381001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9403 + ... + 13006.

Almost surely, 2^40381018 is an apocalyptic number.

40381018 is a deficient number, since it is larger than the sum of its proper divisors (24966542).

40381018 is a wasteful number, since it uses less digits than its factorization.

40381018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22481.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 40381018 is about 6354.6060460110. The cubic root of 40381018 is about 343.0776456404.

The spelling of 40381018 in words is "forty million, three hundred eighty-one thousand, eighteen".