13993623 has 24 divisors (see below), whose sum is σ = 23269376. Its totient is φ = 7938000.

The previous prime is 13993621. The next prime is 13993691. The reversal of 13993623 is 32639931.

It is a happy number.

It is not a de Polignac number, because 13993623 - 2¹ = 13993621 is a prime.

It is a super-2 number, since 2×13993623² = 391642969332258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13993621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8778 + ... + 10248.

Almost surely, 2^13993623 is an apocalyptic number.

13993623 is a deficient number, since it is larger than the sum of its proper divisors (9275753).

13993623 is a wasteful number, since it uses less digits than its factorization.

13993623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635 (or 1632 counting only the distinct ones).

The product of its digits is 26244, while the sum is 36.

The square root of 13993623 is about 3740.8051272420. The cubic root of 13993623 is about 240.9776268666.

The spelling of 13993623 in words is "thirteen million, nine hundred ninety-three thousand, six hundred twenty-three".