1398564 has 36 divisors (see below), whose sum is σ = 3606876. Its totient is φ = 456768.

The previous prime is 1398559. The next prime is 1398569. The reversal of 1398564 is 4658931.

1398564 is a `hidden beast` number, since 1 + 3 + 98 + 564 = 666.

It is an interprime number because it is at equal distance from previous prime (1398559) and next prime (1398569).

It can be written as a sum of positive squares in 2 ways, for example, as 1232100 + 166464 = 1110^2 + 408^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1398569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1542 + ... + 2274.

It is an arithmetic number, because the mean of its divisors is an integer number (100191).

2^1398564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1803438).

1398564 is an abundant number, since it is smaller than the sum of its proper divisors (2208312).

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

1398564 is a wasteful number, since it uses less digits than its factorization.

1398564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 791 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1398564 is about 1182.6089801790. The cubic root of 1398564 is about 111.8306326157.

The spelling of 1398564 in words is "one million, three hundred ninety-eight thousand, five hundred sixty-four".