1398647 has 4 divisors (see below), whose sum is σ = 1472280. Its totient is φ = 1325016.

The previous prime is 1398623. The next prime is 1398659. The reversal of 1398647 is 7468931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1398647 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1398647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398667) 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, 36788 + ... + 36825.

It is an arithmetic number, because the mean of its divisors is an integer number (368070).

2^1398647 is an apocalyptic number.

1398647 is a deficient number, since it is larger than the sum of its proper divisors (73633).

1398647 is an equidigital number, since it uses as much as digits as its factorization.

1398647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73632.

The product of its digits is 36288, while the sum is 38.

The square root of 1398647 is about 1182.6440715617. The cubic root of 1398647 is about 111.8328448274.

The spelling of 1398647 in words is "one million, three hundred ninety-eight thousand, six hundred forty-seven".