340287321 has 16 divisors (see below), whose sum is σ = 521015040. Its totient is φ = 195379920.

The previous prime is 340287293. The next prime is 340287361. The reversal of 340287321 is 123782043.

It is not a de Polignac number, because 340287321 - 2⁶ = 340287257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (340287361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270735 + ... + 271988.

It is an arithmetic number, because the mean of its divisors is an integer number (32563440).

Almost surely, 2^340287321 is an apocalyptic number.

It is an amenable number.

340287321 is a deficient number, since it is larger than the sum of its proper divisors (180727719).

340287321 is a wasteful number, since it uses less digits than its factorization.

340287321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542756.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 340287321 is about 18446.8783538028. The cubic root of 340287321 is about 698.1497538582.

It can be divided in two parts, 340 and 287321, that added together give a triangular number (287661 = T₇₅₈).

The spelling of 340287321 in words is "three hundred forty million, two hundred eighty-seven thousand, three hundred twenty-one".