13621438 has 4 divisors (see below), whose sum is σ = 20432160. Its totient is φ = 6810718.

The previous prime is 13621429. The next prime is 13621453. The reversal of 13621438 is 83412631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83412631 = 5107 ⋅16333.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3405358 + ... + 3405361.

It is an arithmetic number, because the mean of its divisors is an integer number (5108040).

Almost surely, 2^13621438 is an apocalyptic number.

13621438 is a deficient number, since it is larger than the sum of its proper divisors (6810722).

13621438 is an equidigital number, since it uses as much as digits as its factorization.

13621438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810721.

The product of its digits is 3456, while the sum is 28.

The square root of 13621438 is about 3690.7232353565. The cubic root of 13621438 is about 238.8219935842.

The spelling of 13621438 in words is "thirteen million, six hundred twenty-one thousand, four hundred thirty-eight".