140821617 has 16 divisors (see below), whose sum is σ = 197670528. Its totient is φ = 88999680.

The previous prime is 140821609. The next prime is 140821643. The reversal of 140821617 is 716128041.

It is not a de Polignac number, because 140821617 - 2³ = 140821609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140821607) 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 15 ways as a sum of consecutive naturals, for example, 1234 + ... + 16827.

It is an arithmetic number, because the mean of its divisors is an integer number (12354408).

Almost surely, 2^140821617 is an apocalyptic number.

It is an amenable number.

140821617 is a deficient number, since it is larger than the sum of its proper divisors (56848911).

140821617 is a wasteful number, since it uses less digits than its factorization.

140821617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18200.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 140821617 is about 11866.8284305454. The cubic root of 140821617 is about 520.2632013226.

Adding to 140821617 its reverse (716128041), we get a palindrome (856949658).

The spelling of 140821617 in words is "one hundred forty million, eight hundred twenty-one thousand, six hundred seventeen".