1398643 has 4 divisors (see below), whose sum is σ = 1413160. Its totient is φ = 1384128.

The previous prime is 1398623. The next prime is 1398659. The reversal of 1398643 is 3468931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1398643 - 2⁵ = 1398611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1398599 and 1398608.

It is not an unprimeable number, because it can be changed into a prime (1398623) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 7113 + ... + 7306.

It is an arithmetic number, because the mean of its divisors is an integer number (353290).

2^1398643 is an apocalyptic number.

1398643 is a deficient number, since it is larger than the sum of its proper divisors (14517).

1398643 is an equidigital number, since it uses as much as digits as its factorization.

1398643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14516.

The product of its digits is 15552, while the sum is 34.

The square root of 1398643 is about 1182.6423804346. The cubic root of 1398643 is about 111.8327382168.

The spelling of 1398643 in words is "one million, three hundred ninety-eight thousand, six hundred forty-three".