340420321 has 16 divisors (see below), whose sum is σ = 365601600. Its totient is φ = 316008000.

The previous prime is 340420303. The next prime is 340420351. The reversal of 340420321 is 123024043.

It is not a de Polignac number, because 340420321 - 2⁹ = 340419809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340420351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485271 + ... + 485971.

It is an arithmetic number, because the mean of its divisors is an integer number (22850100).

Almost surely, 2^340420321 is an apocalyptic number.

It is an amenable number.

340420321 is a deficient number, since it is larger than the sum of its proper divisors (25181279).

340420321 is a wasteful number, since it uses less digits than its factorization.

340420321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200.

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

The square root of 340420321 is about 18450.4829476087. The cubic root of 340420321 is about 698.2406983992.

Adding to 340420321 its reverse (123024043), we get a palindrome (463444364).

The spelling of 340420321 in words is "three hundred forty million, four hundred twenty thousand, three hundred twenty-one".