1397564 has 48 divisors (see below), whose sum is σ = 3064320. Its totient is φ = 544320.

The previous prime is 1397563. The next prime is 1397569. The reversal of 1397564 is 4657931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19649 + ... + 19719.

It is an arithmetic number, because the mean of its divisors is an integer number (63840).

2^1397564 is an apocalyptic number.

1397564 is a gapful number since it is divisible by the number (14) 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 1397564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1532160).

1397564 is an abundant number, since it is smaller than the sum of its proper divisors (1666756).

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

1397564 is a wasteful number, since it uses less digits than its factorization.

1397564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 136 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 1397564 is about 1182.1861105596. The cubic root of 1397564 is about 111.8039725804.

The spelling of 1397564 in words is "one million, three hundred ninety-seven thousand, five hundred sixty-four".