402440443 has 4 divisors (see below), whose sum is σ = 402810408. Its totient is φ = 402070480.

The previous prime is 402440429. The next prime is 402440449. The reversal of 402440443 is 344044204.

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 402440443 - 2⁵ = 402440411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402440449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183346 + ... + 185527.

It is an arithmetic number, because the mean of its divisors is an integer number (100702602).

Almost surely, 2^402440443 is an apocalyptic number.

402440443 is a deficient number, since it is larger than the sum of its proper divisors (369965).

402440443 is a wasteful number, since it uses less digits than its factorization.

402440443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369964.

The product of its (nonzero) digits is 6144, while the sum is 25.

The square root of 402440443 is about 20060.9182990211. The cubic root of 402440443 is about 738.3017074382.

Adding to 402440443 its reverse (344044204), we get a palindrome (746484647).

The spelling of 402440443 in words is "four hundred two million, four hundred forty thousand, four hundred forty-three".