1213839 has 32 divisors (see below), whose sum is σ = 2023680. Its totient is φ = 712800.

The previous prime is 1213837. The next prime is 1213841. The reversal of 1213839 is 9383121.

It is an interprime number because it is at equal distance from previous prime (1213837) and next prime (1213841).

It is not a de Polignac number, because 1213839 - 2¹ = 1213837 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18084 + ... + 18150.

It is an arithmetic number, because the mean of its divisors is an integer number (63240).

2^1213839 is an apocalyptic number.

1213839 is a deficient number, since it is larger than the sum of its proper divisors (809841).

1213839 is a wasteful number, since it uses less digits than its factorization.

1213839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 142 counting only the distinct ones).

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

The square root of 1213839 is about 1101.7436180891. The cubic root of 1213839 is about 106.6728002115.

The spelling of 1213839 in words is "one million, two hundred thirteen thousand, eight hundred thirty-nine".