340440320 has 72 divisors (see below), whose sum is σ = 889630560. Its totient is φ = 123791360.

The previous prime is 340440313. The next prime is 340440323. The reversal of 340440320 is 23044043.

It is a happy number.

It is a super-2 number, since 2×340440320² = 231799222963404800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 340440292 and 340440301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340440323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1991 + ... + 26169.

It is an arithmetic number, because the mean of its divisors is an integer number (12355980).

Almost surely, 2^340440320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 340440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (444815280).

340440320 is an abundant number, since it is smaller than the sum of its proper divisors (549190240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

340440320 is a wasteful number, since it uses less digits than its factorization.

340440320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24211 (or 24197 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 340440320 is about 18451.0249037824. The cubic root of 340440320 is about 698.2543715374.

Adding to 340440320 its reverse (23044043), we get a palindrome (363484363).

The spelling of 340440320 in words is "three hundred forty million, four hundred forty thousand, three hundred twenty".