40078018 has 8 divisors (see below), whose sum is σ = 60500412. Its totient is φ = 19911216.

The previous prime is 40078007. The next prime is 40078019. The reversal of 40078018 is 81087004.

It can be written as a sum of positive squares in 2 ways, for example, as 40030929 + 47089 = 6327^2 + 217^2 .

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

It is not an unprimeable number, because it can be changed into a prime (40078019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 63505 + ... + 64132.

Almost surely, 2^40078018 is an apocalyptic number.

40078018 is a deficient number, since it is larger than the sum of its proper divisors (20422394).

40078018 is a wasteful number, since it uses less digits than its factorization.

40078018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127796.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 40078018 is about 6330.7201802007. The cubic root of 40078018 is about 342.2173931045.

The spelling of 40078018 in words is "forty million, seventy-eight thousand, eighteen".