1397643 has 8 divisors (see below), whose sum is σ = 2006928.
Its totient is φ = 860064.
The previous prime is 1397633. The next prime is 1397657. The reversal of 1397643 is 3467931.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 1397643 - 26 = 1397579 is a prime.
It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is not an unprimeable number, because it can be changed into a prime (1397603) 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 in 7 ways as a sum of consecutive naturals, for example, 17880 + ... + 17957.
It is an arithmetic number, because the mean of its divisors is an integer number (250866).
21397643 is an apocalyptic number.
1397643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.
1397643 is a deficient number, since it is larger than the sum of its proper divisors (609285).
1397643 is a wasteful number, since it uses less digits than its factorization.
1397643 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 35853.
The product of its digits is 13608, while the sum is 33.
The square root of 1397643 is about 1182.2195227622.
The cubic root of 1397643 is about 111.8060791857.
The spelling of 1397643 in words is "one million, three hundred ninety-seven thousand, six hundred forty-three".