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BaseRepresentation
bin10101110001
31220121
4111301
521033
610241
74030
oct2561
91817
101393
111057
12981
13832
14717
1562d
hex571

1393 has 4 divisors (see below), whose sum is σ = 1600. Its totient is φ = 1188.

The previous prime is 1381. The next prime is 1399. The reversal of 1393 is 3931.

It is a happy number.

1393 is nontrivially palindromic in base 14.

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.

It is a cyclic number.

It is not a de Polignac number, because 1393 - 25 = 1361 is a prime.

It is a Duffinian number.

1393 is an undulating number in base 14.

It is a nialpdrome in base 12 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93 + ... + 106.

It is an arithmetic number, because the mean of its divisors is an integer number (400).

It is an amenable number.

1393 is a deficient number, since it is larger than the sum of its proper divisors (207).

1393 is an equidigital number, since it uses as much as digits as its factorization.

1393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its digits is 81, while the sum is 16.

The square root of 1393 is about 37.3229152130. The cubic root of 1393 is about 11.1682134438.

The spelling of 1393 in words is "one thousand, three hundred ninety-three".

Divisors: 1 7 199 1393