42699623 has 2 divisors, whose sum is σ = 42699624. Its totient is φ = 42699622.

The previous prime is 42699611. The next prime is 42699653. The reversal of 42699623 is 32699624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42699623 - 2¹⁶ = 42634087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42699653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21349811 + 21349812.

It is an arithmetic number, because the mean of its divisors is an integer number (21349812).

Almost surely, 2^42699623 is an apocalyptic number.

42699623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42699623 is an equidigital number, since it uses as much as digits as its factorization.

42699623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 42699623 is about 6534.4948542332. The cubic root of 42699623 is about 349.5221315182.

Subtracting from 42699623 its reverse (32699624), we obtain a palindrome (9999999).

The spelling of 42699623 in words is "forty-two million, six hundred ninety-nine thousand, six hundred twenty-three".