621489 has 16 divisors (see below), whose sum is σ = 930240. Its totient is φ = 365760.

The previous prime is 621473. The next prime is 621521. The reversal of 621489 is 984126.

It is not a de Polignac number, because 621489 - 2⁴ = 621473 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 967 + ... + 1475.

It is an arithmetic number, because the mean of its divisors is an integer number (58140).

2⁶²¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

621489 is a deficient number, since it is larger than the sum of its proper divisors (308751).

621489 is a wasteful number, since it uses less digits than its factorization.

621489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its digits is 3456, while the sum is 30.

The square root of 621489 is about 788.3457363365. The cubic root of 621489 is about 85.3383972554.

It can be divided in two parts, 62 and 1489, that added together give a palindrome (1551).

The spelling of 621489 in words is "six hundred twenty-one thousand, four hundred eighty-nine".