40402643 has 2 divisors, whose sum is σ = 40402644. Its totient is φ = 40402642.

The previous prime is 40402633. The next prime is 40402667. The reversal of 40402643 is 34620404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40402643 - 2²⁰ = 39354067 is a prime.

It is a super-2 number, since 2×40402643² = 3264747122770898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40402603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201321 + 20201322.

It is an arithmetic number, because the mean of its divisors is an integer number (20201322).

Almost surely, 2^40402643 is an apocalyptic number.

40402643 is a deficient number, since it is larger than the sum of its proper divisors (1).

40402643 is an equidigital number, since it uses as much as digits as its factorization.

40402643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 40402643 is about 6356.3073399577. The cubic root of 40402643 is about 343.1388768037.

The spelling of 40402643 in words is "forty million, four hundred two thousand, six hundred forty-three".