624989 has 4 divisors (see below), whose sum is σ = 629280. Its totient is φ = 620700.

The previous prime is 624983. The next prime is 624997. The reversal of 624989 is 989426.

624989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 989426 = 2 ⋅494713.

It is a cyclic number.

It is not a de Polignac number, because 624989 - 2⁴ = 624973 is a prime.

It is a super-2 number, since 2×624989² = 781222500242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624983) 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, 1919 + ... + 2220.

It is an arithmetic number, because the mean of its divisors is an integer number (157320).

2⁶²⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

624989 is a deficient number, since it is larger than the sum of its proper divisors (4291).

624989 is a wasteful number, since it uses less digits than its factorization.

624989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290.

The product of its digits is 31104, while the sum is 38.

The square root of 624989 is about 790.5624580006. The cubic root of 624989 is about 85.4982957379.

The spelling of 624989 in words is "six hundred twenty-four thousand, nine hundred eighty-nine".