13213923 has 4 divisors (see below), whose sum is σ = 17618568. Its totient is φ = 8809280.

The previous prime is 13213901. The next prime is 13213933. The reversal of 13213923 is 32931231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13213923 - 2⁸ = 13213667 is a prime.

It is a super-2 number, since 2×13213923² = 349215522099858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13213893 and 13213902.

It is not an unprimeable number, because it can be changed into a prime (13213933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202318 + ... + 2202323.

It is an arithmetic number, because the mean of its divisors is an integer number (4404642).

Almost surely, 2^13213923 is an apocalyptic number.

13213923 is a deficient number, since it is larger than the sum of its proper divisors (4404645).

13213923 is an equidigital number, since it uses as much as digits as its factorization.

13213923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404644.

The product of its digits is 972, while the sum is 24.

The square root of 13213923 is about 3635.0960097362. The cubic root of 13213923 is about 236.4162134831.

The spelling of 13213923 in words is "thirteen million, two hundred thirteen thousand, nine hundred twenty-three".