40389518 has 64 divisors (see below), whose sum is σ = 75116160. Its totient is φ = 16084992.

The previous prime is 40389511. The next prime is 40389521. The reversal of 40389518 is 81598304.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40389511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294746 + ... + 294882.

It is an arithmetic number, because the mean of its divisors is an integer number (1173690).

Almost surely, 2^40389518 is an apocalyptic number.

40389518 is a deficient number, since it is larger than the sum of its proper divisors (34726642).

40389518 is a wasteful number, since it uses less digits than its factorization.

40389518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 40389518 is about 6355.2748170319. The cubic root of 40389518 is about 343.1017159879.

The spelling of 40389518 in words is "forty million, three hundred eighty-nine thousand, five hundred eighteen".