340311521 has 32 divisors (see below), whose sum is σ = 398103552. Its totient is φ = 288000000.

The previous prime is 340311511. The next prime is 340311523. The reversal of 340311521 is 125113043.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340311521 is a prime.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 340311493 and 340311502.

It is not an unprimeable number, because it can be changed into a prime (340311523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1411961 + ... + 1412201.

It is an arithmetic number, because the mean of its divisors is an integer number (12440736).

Almost surely, 2^340311521 is an apocalyptic number.

340311521 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

340311521 is a deficient number, since it is larger than the sum of its proper divisors (57792031).

340311521 is a wasteful number, since it uses less digits than its factorization.

340311521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 340311521 is about 18447.5342796808. The cubic root of 340311521 is about 698.1663034253.

Adding to 340311521 its reverse (125113043), we get a palindrome (465424564).

The spelling of 340311521 in words is "three hundred forty million, three hundred eleven thousand, five hundred twenty-one".