42120623 has 2 divisors, whose sum is σ = 42120624. Its totient is φ = 42120622.

The previous prime is 42120593. The next prime is 42120647. The reversal of 42120623 is 32602124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42120623 - 2⁸ = 42120367 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 42120595 and 42120604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42120523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060311 + 21060312.

It is an arithmetic number, because the mean of its divisors is an integer number (21060312).

Almost surely, 2^42120623 is an apocalyptic number.

42120623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42120623 is an equidigital number, since it uses as much as digits as its factorization.

42120623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 42120623 is about 6490.0402926330. The cubic root of 42120623 is about 347.9351152866.

Adding to 42120623 its reverse (32602124), we get a palindrome (74722747).

The spelling of 42120623 in words is "forty-two million, one hundred twenty thousand, six hundred twenty-three".