920989 has 6 divisors (see below), whose sum is σ = 963326. Its totient is φ = 880440.

The previous prime is 920971. The next prime is 920999. The reversal of 920989 is 989029.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 444889 = 690^2 + 667^2 .

It is not a de Polignac number, because 920989 - 2⁵ = 920957 is a prime.

It is a Duffinian number.

920989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 342 + ... + 1399.

2⁹²⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

920989 is a deficient number, since it is larger than the sum of its proper divisors (42337).

920989 is a wasteful number, since it uses less digits than its factorization.

920989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 920989 is about 959.6817180712. The cubic root of 920989 is about 97.2937212406.

The spelling of 920989 in words is "nine hundred twenty thousand, nine hundred eighty-nine".