13813438 has 4 divisors (see below), whose sum is σ = 20720160. Its totient is φ = 6906718.

The previous prime is 13813421. The next prime is 13813439. The reversal of 13813438 is 83431831.

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

It is a super-2 number, since 2×13813438² = 381622138759688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13813439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3453358 + ... + 3453361.

It is an arithmetic number, because the mean of its divisors is an integer number (5180040).

Almost surely, 2^13813438 is an apocalyptic number.

13813438 is a deficient number, since it is larger than the sum of its proper divisors (6906722).

13813438 is an equidigital number, since it uses as much as digits as its factorization.

13813438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6906721.

The product of its digits is 6912, while the sum is 31.

The square root of 13813438 is about 3716.6433781034. The cubic root of 13813438 is about 239.9388617416.

The spelling of 13813438 in words is "thirteen million, eight hundred thirteen thousand, four hundred thirty-eight".