402342123 has 4 divisors (see below), whose sum is σ = 536456168. Its totient is φ = 268228080.

The previous prime is 402342113. The next prime is 402342131. The reversal of 402342123 is 321243204.

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

It is not a de Polignac number, because 402342123 - 2⁵ = 402342091 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 402342123.

It is not an unprimeable number, because it can be changed into a prime (402342113) 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, 67057018 + ... + 67057023.

It is an arithmetic number, because the mean of its divisors is an integer number (134114042).

Almost surely, 2^402342123 is an apocalyptic number.

402342123 is a deficient number, since it is larger than the sum of its proper divisors (134114045).

402342123 is a wasteful number, since it uses less digits than its factorization.

402342123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134114044.

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

The square root of 402342123 is about 20058.4676134544. The cubic root of 402342123 is about 738.2415778485.

Adding to 402342123 its reverse (321243204), we get a palindrome (723585327).

The spelling of 402342123 in words is "four hundred two million, three hundred forty-two thousand, one hundred twenty-three".