140247817 has 4 divisors (see below), whose sum is σ = 142341136. Its totient is φ = 138154500.

The previous prime is 140247763. The next prime is 140247823. The reversal of 140247817 is 718742041.

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 140247817 - 2²³ = 131859209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140247827) 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, 1046559 + ... + 1046692.

It is an arithmetic number, because the mean of its divisors is an integer number (35585284).

Almost surely, 2^140247817 is an apocalyptic number.

It is an amenable number.

140247817 is a deficient number, since it is larger than the sum of its proper divisors (2093319).

140247817 is an equidigital number, since it uses as much as digits as its factorization.

140247817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093318.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 140247817 is about 11842.6271156361. The cubic root of 140247817 is about 519.5556077564. Note that the first 3 decimals are identical.

Adding to 140247817 its reverse (718742041), we get a palindrome (858989858).

The spelling of 140247817 in words is "one hundred forty million, two hundred forty-seven thousand, eight hundred seventeen".