42809018 has 16 divisors (see below), whose sum is σ = 73558464. Its totient is φ = 18303840.

The previous prime is 42808991. The next prime is 42809027. The reversal of 42809018 is 81090824.

It is a happy number.

It is a super-2 number, since 2×42809018² = 3665224044248648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3053 + ... + 9743.

It is an arithmetic number, because the mean of its divisors is an integer number (4597404).

Almost surely, 2^42809018 is an apocalyptic number.

42809018 is a deficient number, since it is larger than the sum of its proper divisors (30749446).

42809018 is a wasteful number, since it uses less digits than its factorization.

42809018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7157.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 42809018 is about 6542.8600779781. The cubic root of 42809018 is about 349.8203649622.

The spelling of 42809018 in words is "forty-two million, eight hundred nine thousand, eighteen".