402540143 has 2 divisors, whose sum is σ = 402540144. Its totient is φ = 402540142.

The previous prime is 402540139. The next prime is 402540163. The reversal of 402540143 is 341045204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402540143 - 2² = 402540139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402540163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201270071 + 201270072.

It is an arithmetic number, because the mean of its divisors is an integer number (201270072).

Almost surely, 2^402540143 is an apocalyptic number.

402540143 is a deficient number, since it is larger than the sum of its proper divisors (1).

402540143 is an equidigital number, since it uses as much as digits as its factorization.

402540143 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 23.

The square root of 402540143 is about 20063.4030762481. The cubic root of 402540143 is about 738.3626709951.

Adding to 402540143 its reverse (341045204), we get a palindrome (743585347).

The spelling of 402540143 in words is "four hundred two million, five hundred forty thousand, one hundred forty-three".