340440 has 32 divisors (see below), whose sum is σ = 1021680. Its totient is φ = 90752.

The previous prime is 340429. The next prime is 340447. The reversal of 340440 is 44043.

340440 = T₅₉ + T₆₀ + ... + T₁₃₀.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 340440.

It is not an unprimeable number, because it can be changed into a prime (340447) by changing a digit.

340440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1299 + ... + 1538.

2³⁴⁰⁴⁴⁰ is an apocalyptic number.

340440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

340440 is an abundant number, since it is smaller than the sum of its proper divisors (681240).

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

340440 is a wasteful number, since it uses less digits than its factorization.

340440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851 (or 2847 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 340440 is about 583.4723643841. The cubic root of 340440 is about 69.8254152760.

Adding to 340440 its reverse (44043), we get a palindrome (384483).

It can be divided in two parts, 340 and 440, that added together give a triangular number (780 = T₃₉).

The spelling of 340440 in words is "three hundred forty thousand, four hundred forty", and thus it is an iban number.