6402731 has 2 divisors, whose sum is σ = 6402732. Its totient is φ = 6402730.

The previous prime is 6402719. The next prime is 6402733. The reversal of 6402731 is 1372046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6402731 is a prime.

It is a super-2 number, since 2×6402731² = 81989928516722, which contains 22 as substring.

Together with 6402733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6402697 and 6402706.

It is not a weakly prime, because it can be changed into another prime (6402733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201365 + 3201366.

It is an arithmetic number, because the mean of its divisors is an integer number (3201366).

Almost surely, 2^6402731 is an apocalyptic number.

6402731 is a deficient number, since it is larger than the sum of its proper divisors (1).

6402731 is an equidigital number, since it uses as much as digits as its factorization.

6402731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 6402731 is about 2530.3618318335. The cubic root of 6402731 is about 185.6899582955.

Adding to 6402731 its reverse (1372046), we get a palindrome (7774777).

The spelling of 6402731 in words is "six million, four hundred two thousand, seven hundred thirty-one".