42015231 has 12 divisors (see below), whose sum is σ = 61595352. Its totient is φ = 27591696.

The previous prime is 42015179. The next prime is 42015247. The reversal of 42015231 is 13251024.

42015231 is a `hidden beast` number, since 420 + 15 + 231 = 666.

It is not a de Polignac number, because 42015231 - 2¹⁸ = 41753087 is a prime.

It is a super-2 number, since 2×42015231² = 3530559271966722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42015271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34236 + ... + 35441.

It is an arithmetic number, because the mean of its divisors is an integer number (5132946).

Almost surely, 2^42015231 is an apocalyptic number.

42015231 is a deficient number, since it is larger than the sum of its proper divisors (19580121).

42015231 is a wasteful number, since it uses less digits than its factorization.

42015231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69750 (or 69747 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42015231 is about 6481.9156890537. The cubic root of 42015231 is about 347.6446779516.

Adding to 42015231 its reverse (13251024), we get a palindrome (55266255).

It can be divided in two parts, 420 and 15231, that added together give a palindrome (15651).

The spelling of 42015231 in words is "forty-two million, fifteen thousand, two hundred thirty-one".