42218397 has 36 divisors (see below), whose sum is σ = 67744404. Its totient is φ = 25309440.

The previous prime is 42218387. The next prime is 42218411. The reversal of 42218397 is 79381224.

It can be written as a sum of positive squares in 6 ways, for example, as 4137156 + 38081241 = 2034^2 + 6171^2 .

It is not a de Polignac number, because 42218397 - 2⁴ = 42218381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42218347) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62023 + ... + 62699.

It is an arithmetic number, because the mean of its divisors is an integer number (1881789).

Almost surely, 2^42218397 is an apocalyptic number.

It is an amenable number.

42218397 is a deficient number, since it is larger than the sum of its proper divisors (25526007).

42218397 is a wasteful number, since it uses less digits than its factorization.

42218397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 734 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 42218397 is about 6497.5685452329. The cubic root of 42218397 is about 348.2041261798.

The spelling of 42218397 in words is "forty-two million, two hundred eighteen thousand, three hundred ninety-seven".