340247521 has 4 divisors (see below), whose sum is σ = 340440772. Its totient is φ = 340054272.

The previous prime is 340247483. The next prime is 340247543. The reversal of 340247521 is 125742043.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 216237025 + 124010496 = 14705^2 + 11136^2 .

It is a cyclic number.

It is not a de Polignac number, because 340247521 - 2⁹ = 340247009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340247521.

It is not an unprimeable number, because it can be changed into a prime (340247581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93960 + ... + 97513.

It is an arithmetic number, because the mean of its divisors is an integer number (85110193).

Almost surely, 2^340247521 is an apocalyptic number.

It is an amenable number.

340247521 is a deficient number, since it is larger than the sum of its proper divisors (193251).

340247521 is a wasteful number, since it uses less digits than its factorization.

340247521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193250.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 340247521 is about 18445.7995489488. The cubic root of 340247521 is about 698.1225342687.

Adding to 340247521 its reverse (125742043), we get a palindrome (465989564).

The spelling of 340247521 in words is "three hundred forty million, two hundred forty-seven thousand, five hundred twenty-one".