42420231 has 36 divisors (see below), whose sum is σ = 72967752. Its totient is φ = 23665824.

The previous prime is 42420229. The next prime is 42420239. The reversal of 42420231 is 13202424.

It is not a de Polignac number, because 42420231 - 2¹ = 42420229 is a prime.

It is a super-2 number, since 2×42420231² = 3598951996186722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42420239) 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, 17845 + ... + 20081.

It is an arithmetic number, because the mean of its divisors is an integer number (2026882).

Almost surely, 2^42420231 is an apocalyptic number.

42420231 is a deficient number, since it is larger than the sum of its proper divisors (30547521).

42420231 is a wasteful number, since it uses less digits than its factorization.

42420231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 42420231 is about 6513.0815287389. The cubic root of 42420231 is about 348.7581321571.

Adding to 42420231 its reverse (13202424), we get a palindrome (55622655).

The spelling of 42420231 in words is "forty-two million, four hundred twenty thousand, two hundred thirty-one".