1644349 has 4 divisors (see below), whose sum is σ = 1879264. Its totient is φ = 1409436.

The previous prime is 1644347. The next prime is 1644361. The reversal of 1644349 is 9434461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9434461 = 223 ⋅42307.

It is not a de Polignac number, because 1644349 - 2¹ = 1644347 is a prime.

It is a super-3 number, since 3×1644349³ = 13338385048071121647, which contains 333 as substring.

It is a Duffinian number.

1644349 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1644349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117447 + ... + 117460.

It is an arithmetic number, because the mean of its divisors is an integer number (469816).

2^1644349 is an apocalyptic number.

It is an amenable number.

1644349 is a deficient number, since it is larger than the sum of its proper divisors (234915).

1644349 is an equidigital number, since it uses as much as digits as its factorization.

1644349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234914.

The product of its digits is 10368, while the sum is 31.

The square root of 1644349 is about 1282.3217225018. The cubic root of 1644349 is about 118.0315198762.

The spelling of 1644349 in words is "one million, six hundred forty-four thousand, three hundred forty-nine".