1398681 has 8 divisors (see below), whose sum is σ = 2072160. Its totient is φ = 932436.

The previous prime is 1398667. The next prime is 1398701. The reversal of 1398681 is 1868931.

It is not a de Polignac number, because 1398681 - 2¹⁰ = 1397657 is a prime.

It is a super-2 number, since 2×1398681² = 3912617079522, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1398611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25875 + ... + 25928.

It is an arithmetic number, because the mean of its divisors is an integer number (259020).

2^1398681 is an apocalyptic number.

It is an amenable number.

1398681 is a deficient number, since it is larger than the sum of its proper divisors (673479).

1398681 is an equidigital number, since it uses as much as digits as its factorization.

1398681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51812 (or 51806 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1398681 is about 1182.6584460443. The cubic root of 1398681 is about 111.8337510093.

The spelling of 1398681 in words is "one million, three hundred ninety-eight thousand, six hundred eighty-one".