42097818 has 32 divisors (see below), whose sum is σ = 96929280. Its totient is φ = 11939760.

The previous prime is 42097813. The next prime is 42097819. The reversal of 42097818 is 81879024.

It is a super-2 number, since 2×42097818² = 3544452560722248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42097813) 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 15 ways as a sum of consecutive naturals, for example, 2233 + ... + 9443.

It is an arithmetic number, because the mean of its divisors is an integer number (3029040).

Almost surely, 2^42097818 is an apocalyptic number.

42097818 is an abundant number, since it is smaller than the sum of its proper divisors (54831462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42097818 is a wasteful number, since it uses less digits than its factorization.

42097818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7362.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 42097818 is about 6488.2831319233. The cubic root of 42097818 is about 347.8723107966.

The spelling of 42097818 in words is "forty-two million, ninety-seven thousand, eight hundred eighteen".