40297918 has 4 divisors (see below), whose sum is σ = 60446880. Its totient is φ = 20148958.

The previous prime is 40297903. The next prime is 40297919. The reversal of 40297918 is 81979204.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40297919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074478 + ... + 10074481.

It is an arithmetic number, because the mean of its divisors is an integer number (15111720).

Almost surely, 2^40297918 is an apocalyptic number.

40297918 is a deficient number, since it is larger than the sum of its proper divisors (20148962).

40297918 is a wasteful number, since it uses less digits than its factorization.

40297918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20148961.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 40297918 is about 6348.0641143580. The cubic root of 40297918 is about 342.8421444663.

The spelling of 40297918 in words is "forty million, two hundred ninety-seven thousand, nine hundred eighteen".