42706231 has 4 divisors (see below), whose sum is σ = 42993000. Its totient is φ = 42419464.

The previous prime is 42706219. The next prime is 42706249. The reversal of 42706231 is 13260724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42706231 - 2²³ = 34317623 is a prime.

It is a super-2 number, since 2×42706231² = 3647644332450722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42706196 and 42706205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42706211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143161 + ... + 143458.

It is an arithmetic number, because the mean of its divisors is an integer number (10748250).

Almost surely, 2^42706231 is an apocalyptic number.

42706231 is a deficient number, since it is larger than the sum of its proper divisors (286769).

42706231 is a wasteful number, since it uses less digits than its factorization.

42706231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286768.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 42706231 is about 6535.0004590665. Note that the first 3 decimals coincide. The cubic root of 42706231 is about 349.5401607415.

Adding to 42706231 its reverse (13260724), we get a palindrome (55966955).

It can be divided in two parts, 4270 and 6231, that added together give a palindrome (10501).

The spelling of 42706231 in words is "forty-two million, seven hundred six thousand, two hundred thirty-one".