42623431 has 2 divisors, whose sum is σ = 42623432. Its totient is φ = 42623430.

The previous prime is 42623411. The next prime is 42623443. The reversal of 42623431 is 13432624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42623431 - 2⁹ = 42622919 is a prime.

It is a super-3 number, since 3×42623431³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 42623396 and 42623405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42623411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21311715 + 21311716.

It is an arithmetic number, because the mean of its divisors is an integer number (21311716).

Almost surely, 2^42623431 is an apocalyptic number.

42623431 is a deficient number, since it is larger than the sum of its proper divisors (1).

42623431 is an equidigital number, since it uses as much as digits as its factorization.

42623431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 25.

The square root of 42623431 is about 6528.6622672643. The cubic root of 42623431 is about 349.3141152732.

The spelling of 42623431 in words is "forty-two million, six hundred twenty-three thousand, four hundred thirty-one".