439775661 has 16 divisors (see below), whose sum is σ = 631856960. Its totient is φ = 270466560.

The previous prime is 439775639. The next prime is 439775689. The reversal of 439775661 is 166577934.

It is a happy number.

It is not a de Polignac number, because 439775661 - 2¹¹ = 439773613 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 439775661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439775461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104445 + ... + 108573.

It is an arithmetic number, because the mean of its divisors is an integer number (39491060).

Almost surely, 2^439775661 is an apocalyptic number.

It is an amenable number.

439775661 is a deficient number, since it is larger than the sum of its proper divisors (192081299).

439775661 is a wasteful number, since it uses less digits than its factorization.

439775661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876.

The product of its digits is 952560, while the sum is 48.

The square root of 439775661 is about 20970.8288105168. The cubic root of 439775661 is about 760.4612049418.

The spelling of 439775661 in words is "four hundred thirty-nine million, seven hundred seventy-five thousand, six hundred sixty-one".