1645244 has 6 divisors (see below), whose sum is σ = 2879184. Its totient is φ = 822620.

The previous prime is 1645211. The next prime is 1645249. The reversal of 1645244 is 4425461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645249) 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 as a sum of consecutive naturals, namely, 205652 + ... + 205659.

It is an arithmetic number, because the mean of its divisors is an integer number (479864).

2^1645244 is an apocalyptic number.

It is an amenable number.

1645244 is a deficient number, since it is larger than the sum of its proper divisors (1233940).

1645244 is a wasteful number, since it uses less digits than its factorization.

1645244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411315 (or 411313 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 1645244 is about 1282.6706514145. The cubic root of 1645244 is about 118.0529303858.

It can be divided in two parts, 164 and 5244, that multiplied together give a triangular number (860016 = T₁₃₁₁).

The spelling of 1645244 in words is "one million, six hundred forty-five thousand, two hundred forty-four".