439847981 has 4 divisors (see below), whose sum is σ = 440102364. Its totient is φ = 439593600.

The previous prime is 439847963. The next prime is 439848011. The reversal of 439847981 is 189748934.

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 3455881 + 436392100 = 1859^2 + 20890^2 .

It is a cyclic number.

It is not a de Polignac number, because 439847981 - 2⁶ = 439847917 is a prime.

It is a super-2 number, since 2×439847981² = 386932492779552722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439847921) 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, 124580 + ... + 128061.

It is an arithmetic number, because the mean of its divisors is an integer number (110025591).

Almost surely, 2^439847981 is an apocalyptic number.

It is an amenable number.

439847981 is a deficient number, since it is larger than the sum of its proper divisors (254383).

439847981 is a wasteful number, since it uses less digits than its factorization.

439847981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254382.

The product of its digits is 1741824, while the sum is 53.

The square root of 439847981 is about 20972.5530396278. The cubic root of 439847981 is about 760.5028879670.

The spelling of 439847981 in words is "four hundred thirty-nine million, eight hundred forty-seven thousand, nine hundred eighty-one".