1239813 has 16 divisors (see below), whose sum is σ = 1877760. Its totient is φ = 808128.

The previous prime is 1239803. The next prime is 1239817. The reversal of 1239813 is 3189321.

It is not a de Polignac number, because 1239813 - 2¹⁰ = 1238789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239817) 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, 781 + ... + 1757.

It is an arithmetic number, because the mean of its divisors is an integer number (117360).

2^1239813 is an apocalyptic number.

It is an amenable number.

1239813 is a deficient number, since it is larger than the sum of its proper divisors (637947).

1239813 is an equidigital number, since it uses as much as digits as its factorization.

1239813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1027 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1239813 is about 1113.4689039214. The cubic root of 1239813 is about 107.4283062620.

The spelling of 1239813 in words is "one million, two hundred thirty-nine thousand, eight hundred thirteen".