402042523 has 2 divisors, whose sum is σ = 402042524. Its totient is φ = 402042522.

The previous prime is 402042497. The next prime is 402042533. The reversal of 402042523 is 325240204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402042523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402042494 and 402042503.

It is not a weakly prime, because it can be changed into another prime (402042533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201021261 + 201021262.

It is an arithmetic number, because the mean of its divisors is an integer number (201021262).

Almost surely, 2^402042523 is an apocalyptic number.

402042523 is a deficient number, since it is larger than the sum of its proper divisors (1).

402042523 is an equidigital number, since it uses as much as digits as its factorization.

402042523 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 402042523 is about 20050.9980549598. The cubic root of 402042523 is about 738.0582909674.

Adding to 402042523 its reverse (325240204), we get a palindrome (727282727).

The spelling of 402042523 in words is "four hundred two million, forty-two thousand, five hundred twenty-three".