40385018 has 4 divisors (see below), whose sum is σ = 60577530. Its totient is φ = 20192508.

The previous prime is 40385017. The next prime is 40385021. The reversal of 40385018 is 81058304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22686169 + 17698849 = 4763^2 + 4207^2 .

It is not an unprimeable number, because it can be changed into a prime (40385011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096253 + ... + 10096256.

Almost surely, 2^40385018 is an apocalyptic number.

40385018 is a deficient number, since it is larger than the sum of its proper divisors (20192512).

40385018 is a wasteful number, since it uses less digits than its factorization.

40385018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20192511.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 40385018 is about 6354.9207705525. The cubic root of 40385018 is about 343.0889732835.

The spelling of 40385018 in words is "forty million, three hundred eighty-five thousand, eighteen".