1644104409 has 8 divisors (see below), whose sum is σ = 2307515040. Its totient is φ = 1038381696.

The previous prime is 1644104401. The next prime is 1644104419. The reversal of 1644104409 is 9044014461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1644104409 - 2³ = 1644104401 is a prime.

It is a super-3 number, since 3×1644104409³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1644104409.

It is not an unprimeable number, because it can be changed into a prime (1644104401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14421912 + ... + 14422025.

It is an arithmetic number, because the mean of its divisors is an integer number (288439380).

Almost surely, 2^1644104409 is an apocalyptic number.

1644104409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1644104409 is a deficient number, since it is larger than the sum of its proper divisors (663410631).

1644104409 is a wasteful number, since it uses less digits than its factorization.

1644104409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28843959.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1644104409 is about 40547.5573740269. The cubic root of 1644104409 is about 1180.2566733131.

The spelling of 1644104409 in words is "one billion, six hundred forty-four million, one hundred four thousand, four hundred nine".