49989 has 8 divisors (see below), whose sum is σ = 70240. Its totient is φ = 31536.

The previous prime is 49957. The next prime is 49991. The reversal of 49989 is 98994.

49989 = 42² + 43² + ... + 60².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 49989 - 2⁵ = 49957 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382 + ... + 495.

It is an arithmetic number, because the mean of its divisors is an integer number (8780).

2⁴⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

49989 is a deficient number, since it is larger than the sum of its proper divisors (20251).

49989 is a wasteful number, since it uses less digits than its factorization.

49989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899.

The product of its digits is 23328, while the sum is 39.

The square root of 49989 is about 223.5821996493. The cubic root of 49989 is about 36.8376131652.

The spelling of 49989 in words is "forty-nine thousand, nine hundred eighty-nine".