402540041 has 2 divisors, whose sum is σ = 402540042. Its totient is φ = 402540040.

The previous prime is 402539987. The next prime is 402540107. The reversal of 402540041 is 140045204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297907600 + 104632441 = 17260^2 + 10229^2 .

It is a cyclic number.

It is not a de Polignac number, because 402540041 - 2²⁶ = 335431177 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 402539995 and 402540022.

It is not a weakly prime, because it can be changed into another prime (402543041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201270020 + 201270021.

It is an arithmetic number, because the mean of its divisors is an integer number (201270021).

Almost surely, 2^402540041 is an apocalyptic number.

It is an amenable number.

402540041 is a deficient number, since it is larger than the sum of its proper divisors (1).

402540041 is an equidigital number, since it uses as much as digits as its factorization.

402540041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 402540041 is about 20063.4005343062. The cubic root of 402540041 is about 738.3626086303.

Adding to 402540041 its reverse (140045204), we get a palindrome (542585245).

The spelling of 402540041 in words is "four hundred two million, five hundred forty thousand, forty-one".