340740521 has 4 divisors (see below), whose sum is σ = 371716944. Its totient is φ = 309764100.

The previous prime is 340740473. The next prime is 340740523. The reversal of 340740521 is 125047043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 340740521 - 2⁶ = 340740457 is a prime.

It is a super-2 number, since 2×340740521² = 232208205302702882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (340740523) 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, 15488195 + ... + 15488216.

It is an arithmetic number, because the mean of its divisors is an integer number (92929236).

Almost surely, 2^340740521 is an apocalyptic number.

It is an amenable number.

340740521 is a deficient number, since it is larger than the sum of its proper divisors (30976423).

340740521 is a wasteful number, since it uses less digits than its factorization.

340740521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30976422.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 340740521 is about 18459.1581877398. The cubic root of 340740521 is about 698.4595519709.

Adding to 340740521 its reverse (125047043), we get a palindrome (465787564).

The spelling of 340740521 in words is "three hundred forty million, seven hundred forty thousand, five hundred twenty-one".