1209813 has 16 divisors (see below), whose sum is σ = 1791552. Its totient is φ = 720000.

The previous prime is 1209811. The next prime is 1209821. The reversal of 1209813 is 3189021.

It is not a de Polignac number, because 1209813 - 2¹ = 1209811 is a prime.

1209813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209811) 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, 1713 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (111972).

2^1209813 is an apocalyptic number.

It is an amenable number.

1209813 is a deficient number, since it is larger than the sum of its proper divisors (581739).

1209813 is a wasteful number, since it uses less digits than its factorization.

1209813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1209813 is about 1099.9149967157. The cubic root of 1209813 is about 106.5547339278.

The spelling of 1209813 in words is "one million, two hundred nine thousand, eight hundred thirteen".