1644242 has 8 divisors (see below), whose sum is σ = 2551500. Its totient is φ = 793744.

The previous prime is 1644233. The next prime is 1644283. The reversal of 1644242 is 2424461.

It can be written as a sum of positive squares in 2 ways, for example, as 1515361 + 128881 = 1231^2 + 359^2 .

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

It is a super-3 number, since 3×1644242³ = 13335781377563461464, which contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14117 + ... + 14232.

2^1644242 is an apocalyptic number.

1644242 is a deficient number, since it is larger than the sum of its proper divisors (907258).

1644242 is a wasteful number, since it uses less digits than its factorization.

1644242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28380.

The product of its digits is 1536, while the sum is 23.

The square root of 1644242 is about 1282.2800006239. The cubic root of 1644242 is about 118.0289596641.

The spelling of 1644242 in words is "one million, six hundred forty-four thousand, two hundred forty-two".