345540817 has 4 divisors (see below), whose sum is σ = 354879796. Its totient is φ = 336201840.

The previous prime is 345540803. The next prime is 345540823. The reversal of 345540817 is 718045543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 718045543 = 1061 ⋅676763.

It can be written as a sum of positive squares in 2 ways, for example, as 207619281 + 137921536 = 14409^2 + 11744^2 .

It is a cyclic number.

It is not a de Polignac number, because 345540817 - 2¹⁵ = 345508049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 9338941 = 345540817 / (3 + 4 + 5 + 5 + 4 + 0 + 8 + 1 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345540847) 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, 4669434 + ... + 4669507.

It is an arithmetic number, because the mean of its divisors is an integer number (88719949).

Almost surely, 2^345540817 is an apocalyptic number.

345540817 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

345540817 is a deficient number, since it is larger than the sum of its proper divisors (9338979).

345540817 is an equidigital number, since it uses as much as digits as its factorization.

345540817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9338978.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 345540817 is about 18588.7282243837. The cubic root of 345540817 is about 701.7241965181.

The spelling of 345540817 in words is "three hundred forty-five million, five hundred forty thousand, eight hundred seventeen".