13443749 has 4 divisors (see below), whose sum is σ = 14665920. Its totient is φ = 12221580.

The previous prime is 13443743. The next prime is 13443797. The reversal of 13443749 is 94734431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94734431 = 11 ⋅8612221.

It is a cyclic number.

It is not a de Polignac number, because 13443749 - 2¹² = 13439653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13443743) 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, 611069 + ... + 611090.

It is an arithmetic number, because the mean of its divisors is an integer number (3666480).

Almost surely, 2^13443749 is an apocalyptic number.

It is an amenable number.

13443749 is a deficient number, since it is larger than the sum of its proper divisors (1222171).

13443749 is a wasteful number, since it uses less digits than its factorization.

13443749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222170.

The product of its digits is 36288, while the sum is 35.

The square root of 13443749 is about 3666.5718321069. The cubic root of 13443749 is about 237.7789829635.

The spelling of 13443749 in words is "thirteen million, four hundred forty-three thousand, seven hundred forty-nine".