40002643 has 4 divisors (see below), whose sum is σ = 40017208. Its totient is φ = 39988080.

The previous prime is 40002583. The next prime is 40002647. The reversal of 40002643 is 34620004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40002643 - 2¹⁷ = 39871571 is a prime.

It is a super-2 number, since 2×40002643² = 3200422893970898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40002643.

It is not an unprimeable number, because it can be changed into a prime (40002647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1773 + ... + 9118.

It is an arithmetic number, because the mean of its divisors is an integer number (10004302).

Almost surely, 2^40002643 is an apocalyptic number.

40002643 is a deficient number, since it is larger than the sum of its proper divisors (14565).

40002643 is a wasteful number, since it uses less digits than its factorization.

40002643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14564.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 40002643 is about 6324.7642643817. The cubic root of 40002643 is about 342.0027216135.

Adding to 40002643 its reverse (34620004), we get a palindrome (74622647).

The spelling of 40002643 in words is "forty million, two thousand, six hundred forty-three".