439885661 has 4 divisors (see below), whose sum is σ = 439960092. Its totient is φ = 439811232.

The previous prime is 439885627. The next prime is 439885673. The reversal of 439885661 is 166588934.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42640900 + 397244761 = 6530^2 + 19931^2 .

It is a cyclic number.

It is not a de Polignac number, because 439885661 - 2²² = 435691357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439885261) 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, 27506 + ... + 40451.

It is an arithmetic number, because the mean of its divisors is an integer number (109990023).

Almost surely, 2^439885661 is an apocalyptic number.

It is an amenable number.

439885661 is a deficient number, since it is larger than the sum of its proper divisors (74431).

439885661 is an equidigital number, since it uses as much as digits as its factorization.

439885661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74430.

The product of its digits is 1244160, while the sum is 50.

The square root of 439885661 is about 20973.4513373455. The cubic root of 439885661 is about 760.5246037505.

The spelling of 439885661 in words is "four hundred thirty-nine million, eight hundred eighty-five thousand, six hundred sixty-one".