1393921 has 2 divisors, whose sum is σ = 1393922. Its totient is φ = 1393920.

The previous prime is 1393919. The next prime is 1393927. The reversal of 1393921 is 1293931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1392400 + 1521 = 1180^2 + 39^2 .

It is an emirp because it is prime and its reverse (1293931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1393921 - 2¹ = 1393919 is a prime.

Together with 1393919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1393921.

It is not a weakly prime, because it can be changed into another prime (1393927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696960 + 696961.

It is an arithmetic number, because the mean of its divisors is an integer number (696961).

2^1393921 is an apocalyptic number.

It is an amenable number.

1393921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393921 is an equidigital number, since it uses as much as digits as its factorization.

1393921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 28.

The square root of 1393921 is about 1180.6443156175. The cubic root of 1393921 is about 111.7067423791.

The spelling of 1393921 in words is "one million, three hundred ninety-three thousand, nine hundred twenty-one".