402540323 has 4 divisors (see below), whose sum is σ = 408054648. Its totient is φ = 397026000.

The previous prime is 402540317. The next prime is 402540431. The reversal of 402540323 is 323045204.

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 402540323 - 2¹⁰ = 402539299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402542323) 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, 2757053 + ... + 2757198.

It is an arithmetic number, because the mean of its divisors is an integer number (102013662).

Almost surely, 2^402540323 is an apocalyptic number.

402540323 is a deficient number, since it is larger than the sum of its proper divisors (5514325).

402540323 is an equidigital number, since it uses as much as digits as its factorization.

402540323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5514324.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 402540323 is about 20063.4075620269. The cubic root of 402540323 is about 738.3627810506.

Adding to 402540323 its reverse (323045204), we get a palindrome (725585527).

The spelling of 402540323 in words is "four hundred two million, five hundred forty thousand, three hundred twenty-three".