947989 has 4 divisors (see below), whose sum is σ = 1083424. Its totient is φ = 812556.

The previous prime is 947987. The next prime is 948007. The reversal of 947989 is 989749.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 947989 - 2¹ = 947987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947987) 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, 67707 + ... + 67720.

It is an arithmetic number, because the mean of its divisors is an integer number (270856).

2⁹⁴⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

947989 is a deficient number, since it is larger than the sum of its proper divisors (135435).

947989 is a wasteful number, since it uses less digits than its factorization.

947989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135434.

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

The square root of 947989 is about 973.6472667245. The cubic root of 947989 is about 98.2353430300.

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

The spelling of 947989 in words is "nine hundred forty-seven thousand, nine hundred eighty-nine".