989947 has 12 divisors (see below), whose sum is σ = 1169640. Its totient is φ = 835296.

The previous prime is 989939. The next prime is 989951. The reversal of 989947 is 749989.

It is not a de Polignac number, because 989947 - 2³ = 989939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 989897 and 989906.

It is not an unprimeable number, because it can be changed into a prime (989917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4248 + ... + 4474.

It is an arithmetic number, because the mean of its divisors is an integer number (97470).

2⁹⁸⁹⁹⁴⁷ is an apocalyptic number.

989947 is a deficient number, since it is larger than the sum of its proper divisors (179693).

989947 is a wasteful number, since it uses less digits than its factorization.

989947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 323 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 989947 is about 994.9608032480. The cubic root of 989947 is about 99.6637707660.

It can be divided in two parts, 989 and 947, that added together give a square (1936 = 44²).

The spelling of 989947 in words is "nine hundred eighty-nine thousand, nine hundred forty-seven".