609819 has 16 divisors (see below), whose sum is σ = 944640. Its totient is φ = 342720.

The previous prime is 609809. The next prime is 609821. The reversal of 609819 is 918906.

It is a happy number.

609819 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 609819 - 2⁴ = 609803 is a prime.

It is a super-2 number, since 2×609819² = 743758425522, which contains 22 as substring.

609819 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 609819.

It is not an unprimeable number, because it can be changed into a prime (609809) 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, 1287 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (59040).

2⁶⁰⁹⁸¹⁹ is an apocalyptic number.

609819 is a deficient number, since it is larger than the sum of its proper divisors (334821).

609819 is a wasteful number, since it uses less digits than its factorization.

609819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 609819 is about 780.9090856175. The cubic root of 609819 is about 84.8008718167.

The spelling of 609819 in words is "six hundred nine thousand, eight hundred nineteen".