13921738 has 4 divisors (see below), whose sum is σ = 20882610. Its totient is φ = 6960868.

The previous prime is 13921727. The next prime is 13921771. The reversal of 13921738 is 83712931.

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., 13860729 + 61009 = 3723^2 + 247^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3480433 + ... + 3480436.

Almost surely, 2^13921738 is an apocalyptic number.

13921738 is a deficient number, since it is larger than the sum of its proper divisors (6960872).

13921738 is an equidigital number, since it uses as much as digits as its factorization.

13921738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6960871.

The product of its digits is 9072, while the sum is 34.

The square root of 13921738 is about 3731.1845304139. The cubic root of 13921738 is about 240.5642856433.

The spelling of 13921738 in words is "thirteen million, nine hundred twenty-one thousand, seven hundred thirty-eight".