13775642 has 4 divisors (see below), whose sum is σ = 20663466. Its totient is φ = 6887820.

The previous prime is 13775623. The next prime is 13775647. The reversal of 13775642 is 24657731.

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

It can be written as a sum of positive squares in only one way, i.e., 9114361 + 4661281 = 3019^2 + 2159^2 .

It is not an unprimeable number, because it can be changed into a prime (13775647) 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 as a sum of consecutive naturals, namely, 3443909 + ... + 3443912.

Almost surely, 2^13775642 is an apocalyptic number.

13775642 is a deficient number, since it is larger than the sum of its proper divisors (6887824).

13775642 is an equidigital number, since it uses as much as digits as its factorization.

13775642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887823.

The product of its digits is 35280, while the sum is 35.

The square root of 13775642 is about 3711.5551996434. Note that the first 3 decimals coincide. The cubic root of 13775642 is about 239.7198235116.

The spelling of 13775642 in words is "thirteen million, seven hundred seventy-five thousand, six hundred forty-two".