612909 has 24 divisors (see below), whose sum is σ = 995904. Its totient is φ = 360000.

The previous prime is 612889. The next prime is 612923. The reversal of 612909 is 909216.

It is a happy number.

612909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 612909 - 2⁵ = 612877 is a prime.

It is an alternating number because its digits alternate between even and odd.

612909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3984 + ... + 4134.

It is an arithmetic number, because the mean of its divisors is an integer number (41496).

2⁶¹²⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

612909 is a deficient number, since it is larger than the sum of its proper divisors (382995).

612909 is a wasteful number, since it uses less digits than its factorization.

612909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 612909 is about 782.8850490334. The cubic root of 612909 is about 84.9438614318.

It can be divided in two parts, 612 and 909, that added together give a square (1521 = 39²).

The spelling of 612909 in words is "six hundred twelve thousand, nine hundred nine".