620989 has 4 divisors (see below), whose sum is σ = 622656. Its totient is φ = 619324.

The previous prime is 620981. The next prime is 620999. The reversal of 620989 is 989026.

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 620989 - 2³ = 620981 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12 + ... + 1114.

It is an arithmetic number, because the mean of its divisors is an integer number (155664).

2⁶²⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

620989 is a deficient number, since it is larger than the sum of its proper divisors (1667).

620989 is a wasteful number, since it uses less digits than its factorization.

620989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 620989 is about 788.0285527822. The cubic root of 620989 is about 85.3155056480.

The spelling of 620989 in words is "six hundred twenty thousand, nine hundred eighty-nine".