439661989 has 16 divisors (see below), whose sum is σ = 482961024. Its totient is φ = 397800000.

The previous prime is 439661969. The next prime is 439661993. The reversal of 439661989 is 989166934.

It is not a de Polignac number, because 439661989 - 2⁹ = 439661477 is a prime.

It is a super-2 number, since 2×439661989² = 386605329142872242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439661969) 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, 133614 + ... + 136864.

It is an arithmetic number, because the mean of its divisors is an integer number (30185064).

Almost surely, 2^439661989 is an apocalyptic number.

It is an amenable number.

439661989 is a deficient number, since it is larger than the sum of its proper divisors (43299035).

439661989 is a wasteful number, since it uses less digits than its factorization.

439661989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468.

The product of its digits is 2519424, while the sum is 55.

The square root of 439661989 is about 20968.1183943624. The cubic root of 439661989 is about 760.3956786574.

The spelling of 439661989 in words is "four hundred thirty-nine million, six hundred sixty-one thousand, nine hundred eighty-nine".