340247840 has 24 divisors (see below), whose sum is σ = 803835900. Its totient is φ = 136099072.

The previous prime is 340247837. The next prime is 340247849. The reversal of 340247840 is 48742043.

It can be written as a sum of positive squares in 2 ways, for example, as 329930896 + 10316944 = 18164^2 + 3212^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 340247797 and 340247806.

It is not an unprimeable number, because it can be changed into a prime (340247849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063115 + ... + 1063434.

Almost surely, 2^340247840 is an apocalyptic number.

It is an amenable number.

340247840 is an abundant number, since it is smaller than the sum of its proper divisors (463588060).

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

340247840 is a wasteful number, since it uses less digits than its factorization.

340247840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126564 (or 2126556 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 340247840 is about 18445.8081959019. The cubic root of 340247840 is about 698.1227524442.

Adding to 340247840 its reverse (48742043), we get a palindrome (388989883).

The spelling of 340247840 in words is "three hundred forty million, two hundred forty-seven thousand, eight hundred forty".