42838231 has 2 divisors, whose sum is σ = 42838232. Its totient is φ = 42838230.

The previous prime is 42838219. The next prime is 42838261. The reversal of 42838231 is 13283824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42838231 - 2⁹ = 42837719 is a prime.

It is a super-2 number, since 2×42838231² = 3670228070418722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_2595406 and since 42838231 and 2595406 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 42838193 and 42838202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42838261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21419115 + 21419116.

It is an arithmetic number, because the mean of its divisors is an integer number (21419116).

Almost surely, 2^42838231 is an apocalyptic number.

42838231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42838231 is an equidigital number, since it uses as much as digits as its factorization.

42838231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 42838231 is about 6545.0921307496. The cubic root of 42838231 is about 349.8999196847.

It can be divided in two parts, 4283823 and 1, that added together give a palindrome (4283824).

The spelling of 42838231 in words is "forty-two million, eight hundred thirty-eight thousand, two hundred thirty-one".