1398656 has 48 divisors (see below), whose sum is σ = 3255840. Its totient is φ = 596736.

The previous prime is 1398623. The next prime is 1398659. The reversal of 1398656 is 6568931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6161 + ... + 6383.

It is an arithmetic number, because the mean of its divisors is an integer number (67830).

2^1398656 is an apocalyptic number.

1398656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627920).

1398656 is an abundant number, since it is smaller than the sum of its proper divisors (1857184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398656 is an equidigital number, since it uses as much as digits as its factorization.

1398656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 232 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 1398656 is about 1182.6478765888. The cubic root of 1398656 is about 111.8330847005.

The spelling of 1398656 in words is "one million, three hundred ninety-eight thousand, six hundred fifty-six".