42402523 has 2 divisors, whose sum is σ = 42402524. Its totient is φ = 42402522.

The previous prime is 42402499. The next prime is 42402551. The reversal of 42402523 is 32520424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42402523 - 2²¹ = 40305371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42402494 and 42402503.

It is not a weakly prime, because it can be changed into another prime (42402583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21201261 + 21201262.

It is an arithmetic number, because the mean of its divisors is an integer number (21201262).

Almost surely, 2^42402523 is an apocalyptic number.

42402523 is a deficient number, since it is larger than the sum of its proper divisors (1).

42402523 is an equidigital number, since it uses as much as digits as its factorization.

42402523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42402523 is about 6511.7219688804. The cubic root of 42402523 is about 348.7095966006.

Adding to 42402523 its reverse (32520424), we get a palindrome (74922947).

The spelling of 42402523 in words is "forty-two million, four hundred two thousand, five hundred twenty-three".