1393644 has 48 divisors (see below), whose sum is σ = 3806208. Its totient is φ = 388608.

The previous prime is 1393633. The next prime is 1393649. The reversal of 1393644 is 4463931.

1393644 = T₁₅ + T₁₆ + ... + T₂₀₂.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393649) 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, 3772 + ... + 4124.

It is an arithmetic number, because the mean of its divisors is an integer number (79296).

2^1393644 is an apocalyptic number.

1393644 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 1393644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1903104).

1393644 is an abundant number, since it is smaller than the sum of its proper divisors (2412564).

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

1393644 is a wasteful number, since it uses less digits than its factorization.

1393644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 412 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 1393644 is about 1180.5270009619. The cubic root of 1393644 is about 111.6993424338.

The spelling of 1393644 in words is "one million, three hundred ninety-three thousand, six hundred forty-four".