123826813 has 4 divisors (see below), whose sum is σ = 135083808. Its totient is φ = 112569820.

The previous prime is 123826739. The next prime is 123826823. The reversal of 123826813 is 318628321.

It is a happy number.

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 not a de Polignac number, because 123826813 - 2²⁵ = 90272381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123826823) 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, 5628481 + ... + 5628502.

It is an arithmetic number, because the mean of its divisors is an integer number (33770952).

Almost surely, 2^123826813 is an apocalyptic number.

It is an amenable number.

123826813 is a deficient number, since it is larger than the sum of its proper divisors (11256995).

123826813 is a wasteful number, since it uses less digits than its factorization.

123826813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11256994.

The product of its digits is 13824, while the sum is 34.

The square root of 123826813 is about 11127.7496826627. The cubic root of 123826813 is about 498.4308312371.

The spelling of 123826813 in words is "one hundred twenty-three million, eight hundred twenty-six thousand, eight hundred thirteen".