440189689 has 2 divisors, whose sum is σ = 440189690. Its totient is φ = 440189688.

The previous prime is 440189683. The next prime is 440189699. The reversal of 440189689 is 986981044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230432400 + 209757289 = 15180^2 + 14483^2 .

It is a cyclic number.

It is not a de Polignac number, because 440189689 - 2²¹ = 438092537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (440189683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220094844 + 220094845.

It is an arithmetic number, because the mean of its divisors is an integer number (220094845).

Almost surely, 2^440189689 is an apocalyptic number.

It is an amenable number.

440189689 is a deficient number, since it is larger than the sum of its proper divisors (1).

440189689 is an equidigital number, since it uses as much as digits as its factorization.

440189689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 440189689 is about 20980.6980103141. The cubic root of 440189689 is about 760.6997761840.

The spelling of 440189689 in words is "four hundred forty million, one hundred eighty-nine thousand, six hundred eighty-nine".