402140323 has 4 divisors (see below), whose sum is σ = 433074208. Its totient is φ = 371206440.

The previous prime is 402140317. The next prime is 402140327. The reversal of 402140323 is 323041204.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402140323 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 402140323.

It is not an unprimeable number, because it can be changed into a prime (402140327) 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, 15466923 + ... + 15466948.

It is an arithmetic number, because the mean of its divisors is an integer number (108268552).

Almost surely, 2^402140323 is an apocalyptic number.

402140323 is a deficient number, since it is larger than the sum of its proper divisors (30933885).

402140323 is a wasteful number, since it uses less digits than its factorization.

402140323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30933884.

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

The square root of 402140323 is about 20053.4366880094. The cubic root of 402140323 is about 738.1181322732.

Adding to 402140323 its reverse (323041204), we get a palindrome (725181527).

It can be divided in two parts, 4021 and 40323, that added together give a palindrome (44344).

The spelling of 402140323 in words is "four hundred two million, one hundred forty thousand, three hundred twenty-three".