402243123 has 4 divisors (see below), whose sum is σ = 536324168. Its totient is φ = 268162080.

The previous prime is 402243109. The next prime is 402243133. The reversal of 402243123 is 321342204.

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

It is not a de Polignac number, because 402243123 - 2⁶ = 402243059 is a prime.

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 402243123.

It is not an unprimeable number, because it can be changed into a prime (402243133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67040518 + ... + 67040523.

It is an arithmetic number, because the mean of its divisors is an integer number (134081042).

Almost surely, 2^402243123 is an apocalyptic number.

402243123 is a deficient number, since it is larger than the sum of its proper divisors (134081045).

402243123 is a wasteful number, since it uses less digits than its factorization.

402243123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134081044.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 402243123 is about 20055.9996759075. Note that the first 3 decimals coincide. The cubic root of 402243123 is about 738.1810224925.

Adding to 402243123 its reverse (321342204), we get a palindrome (723585327).

The spelling of 402243123 in words is "four hundred two million, two hundred forty-three thousand, one hundred twenty-three".