168440913 has 12 divisors (see below), whose sum is σ = 257615748. Its totient is φ = 105688320.

The previous prime is 168440911. The next prime is 168440917. The reversal of 168440913 is 319044861.

It can be written as a sum of positive squares in 2 ways, for example, as 145515969 + 22924944 = 12063^2 + 4788^2 .

It is not a de Polignac number, because 168440913 - 2¹ = 168440911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168440911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 550308 + ... + 550613.

It is an arithmetic number, because the mean of its divisors is an integer number (21467979).

Almost surely, 2^168440913 is an apocalyptic number.

It is an amenable number.

168440913 is a deficient number, since it is larger than the sum of its proper divisors (89174835).

168440913 is a wasteful number, since it uses less digits than its factorization.

168440913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100944 (or 1100941 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 168440913 is about 12978.4788399874. The cubic root of 168440913 is about 552.2671300796.

The spelling of 168440913 in words is "one hundred sixty-eight million, four hundred forty thousand, nine hundred thirteen".