1235813 has 4 divisors (see below), whose sum is σ = 1289568. Its totient is φ = 1182060.

The previous prime is 1235807. The next prime is 1235821. The reversal of 1235813 is 3185321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1235813 - 2¹⁰ = 1234789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 53731 = 1235813 / (1 + 2 + 3 + 5 + 8 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26843 + ... + 26888.

It is an arithmetic number, because the mean of its divisors is an integer number (322392).

2^1235813 is an apocalyptic number.

It is an amenable number.

1235813 is a deficient number, since it is larger than the sum of its proper divisors (53755).

1235813 is an equidigital number, since it uses as much as digits as its factorization.

1235813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53754.

The product of its digits is 720, while the sum is 23.

The square root of 1235813 is about 1111.6712643583. The cubic root of 1235813 is about 107.3126500617.

It can be divided in two parts, 1235 and 813, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1235813 in words is "one million, two hundred thirty-five thousand, eight hundred thirteen".