140305817 has 4 divisors (see below), whose sum is σ = 142081920. Its totient is φ = 138529716.

The previous prime is 140305807. The next prime is 140305831. The reversal of 140305817 is 718503041.

140305817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-140305817 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 140305817.

It is not an unprimeable number, because it can be changed into a prime (140305807) 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, 887933 + ... + 888090.

It is an arithmetic number, because the mean of its divisors is an integer number (35520480).

Almost surely, 2^140305817 is an apocalyptic number.

It is an amenable number.

140305817 is a deficient number, since it is larger than the sum of its proper divisors (1776103).

140305817 is an equidigital number, since it uses as much as digits as its factorization.

140305817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776102.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 140305817 is about 11845.0756434900. The cubic root of 140305817 is about 519.6272192624.

Adding to 140305817 its reverse (718503041), we get a palindrome (858808858).

The spelling of 140305817 in words is "one hundred forty million, three hundred five thousand, eight hundred seventeen".