42816623 has 2 divisors, whose sum is σ = 42816624. Its totient is φ = 42816622.

The previous prime is 42816601. The next prime is 42816637. The reversal of 42816623 is 32661824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42816623 - 2⁶ = 42816559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42816623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42816023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21408311 + 21408312.

It is an arithmetic number, because the mean of its divisors is an integer number (21408312).

Almost surely, 2^42816623 is an apocalyptic number.

42816623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42816623 is an equidigital number, since it uses as much as digits as its factorization.

42816623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 32.

The square root of 42816623 is about 6543.4412200309. The cubic root of 42816623 is about 349.8410788715.

The spelling of 42816623 in words is "forty-two million, eight hundred sixteen thousand, six hundred twenty-three".