13921744 has 10 divisors (see below), whose sum is σ = 26973410. Its totient is φ = 6960864.

The previous prime is 13921727. The next prime is 13921771. The reversal of 13921744 is 44712931.

13921744 = T₃₀₄₅ + T₃₀₄₆ + T₃₀₄₇.

13921744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 1587600 = 3512^2 + 1260^2 .

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, 435039 + ... + 435070.

It is an arithmetic number, because the mean of its divisors is an integer number (2697341).

Almost surely, 2^13921744 is an apocalyptic number.

13921744 is the 3047-th centered triangular number.

It is an amenable number.

13921744 is a deficient number, since it is larger than the sum of its proper divisors (13051666).

13921744 is an equidigital number, since it uses as much as digits as its factorization.

13921744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870117 (or 870111 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 13921744 is about 3731.1853344480. The cubic root of 13921744 is about 240.5643202028.

It can be divided in two parts, 1392 and 1744, that added together give a square (3136 = 56²).

The spelling of 13921744 in words is "thirteen million, nine hundred twenty-one thousand, seven hundred forty-four".