1345644 has 18 divisors (see below), whose sum is σ = 3401580. Its totient is φ = 448536.

The previous prime is 1345633. The next prime is 1345649. The reversal of 1345644 is 4465431.

1345644 is a `hidden beast` number, since 13 + 4 + 5 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1345649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18654 + ... + 18725.

2^1345644 is an apocalyptic number.

It is an amenable number.

1345644 is an abundant number, since it is smaller than the sum of its proper divisors (2055936).

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

1345644 is a wasteful number, since it uses less digits than its factorization.

1345644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37389 (or 37384 counting only the distinct ones).

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

The square root of 1345644 is about 1160.0189653622. The cubic root of 1345644 is about 110.4019454604.

It can be divided in two parts, 134 and 5644, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 1345644 in words is "one million, three hundred forty-five thousand, six hundred forty-four".