1398644 has 18 divisors (see below), whose sum is σ = 2651670. Its totient is φ = 645216.

The previous prime is 1398623. The next prime is 1398659. The reversal of 1398644 is 4468931.

It can be written as a sum of positive squares in 3 ways, for example, as 48400 + 1350244 = 220^2 + 1162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359 + ... + 1710.

It is an arithmetic number, because the mean of its divisors is an integer number (147315).

2^1398644 is an apocalyptic number.

It is an amenable number.

1398644 is a deficient number, since it is larger than the sum of its proper divisors (1253026).

1398644 is a wasteful number, since it uses less digits than its factorization.

1398644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099 (or 2084 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 1398644 is about 1182.6428032166. The cubic root of 1398644 is about 111.8327648695.

The spelling of 1398644 in words is "one million, three hundred ninety-eight thousand, six hundred forty-four".