439994987 has 4 divisors (see below), whose sum is σ = 440421960. Its totient is φ = 439568016.

The previous prime is 439994983. The next prime is 439995001. The reversal of 439994987 is 789499934.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 439994987 - 2² = 439994983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (439994981) 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, 211937 + ... + 214002.

It is an arithmetic number, because the mean of its divisors is an integer number (110105490).

Almost surely, 2^439994987 is an apocalyptic number.

439994987 is a deficient number, since it is larger than the sum of its proper divisors (426973).

439994987 is a wasteful number, since it uses less digits than its factorization.

439994987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426972.

The product of its digits is 17635968, while the sum is 62.

The square root of 439994987 is about 20976.0574703637. The cubic root of 439994987 is about 760.5876036261.

The spelling of 439994987 in words is "four hundred thirty-nine million, nine hundred ninety-four thousand, nine hundred eighty-seven".