40257218 has 8 divisors (see below), whose sum is σ = 61287312. Its totient is φ = 19828116.

The previous prime is 40257211. The next prime is 40257227. The reversal of 40257218 is 81275204.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40257211) 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, 150080 + ... + 150347.

It is an arithmetic number, because the mean of its divisors is an integer number (7660914).

Almost surely, 2^40257218 is an apocalyptic number.

40257218 is a deficient number, since it is larger than the sum of its proper divisors (21030094).

40257218 is a wasteful number, since it uses less digits than its factorization.

40257218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300496.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 40257218 is about 6344.8576028151. The cubic root of 40257218 is about 342.7266846092.

The spelling of 40257218 in words is "forty million, two hundred fifty-seven thousand, two hundred eighteen".