1645344 has 72 divisors (see below), whose sum is σ = 4864860. Its totient is φ = 526848.

The previous prime is 1645337. The next prime is 1645349. The reversal of 1645344 is 4435461.

1645344 = T₁₉₄ + T₁₉₅ + ... + T₂₅₇.

It can be written as a sum of positive squares in 2 ways, for example, as 1468944 + 176400 = 1212^2 + 420^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1645349) 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, 8254 + ... + 8450.

2^1645344 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 1645344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2432430).

1645344 is an abundant number, since it is smaller than the sum of its proper divisors (3219516).

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

1645344 is a wasteful number, since it uses less digits than its factorization.

1645344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 231 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 1645344 is about 1282.7096319900. The cubic root of 1645344 is about 118.0553221392.

The spelling of 1645344 in words is "one million, six hundred forty-five thousand, three hundred forty-four".