42861231 has 30 divisors (see below), whose sum is σ = 74487600. Its totient is φ = 24489864.

The previous prime is 42861229. The next prime is 42861257. The reversal of 42861231 is 13216824.

42861231 is a `hidden beast` number, since 42 + 8 + 612 + 3 + 1 = 666.

It is not a de Polignac number, because 42861231 - 2¹ = 42861229 is a prime.

It is a super-2 number, since 2×42861231² = 3674170245670722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 42861195 and 42861204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42861271) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1431 + ... + 9368.

It is an arithmetic number, because the mean of its divisors is an integer number (2482920).

Almost surely, 2^42861231 is an apocalyptic number.

42861231 is a deficient number, since it is larger than the sum of its proper divisors (31626369).

42861231 is a wasteful number, since it uses less digits than its factorization.

42861231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10825 (or 10809 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 42861231 is about 6546.8489367023. The cubic root of 42861231 is about 349.9625293219.

The spelling of 42861231 in words is "forty-two million, eight hundred sixty-one thousand, two hundred thirty-one".