1864944 has 50 divisors (see below), whose sum is σ = 5401440. Its totient is φ = 621216.

The previous prime is 1864939. The next prime is 1864979. The reversal of 1864944 is 4494681.

It is a happy number.

1864944 is a `hidden beast` number, since 1 + 8 + 649 + 4 + 4 = 666.

It is a super-2 number, since 2×1864944² = 6956032246272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1864899 and 1864908.

It is a congruent number.

It is an unprimeable number.

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 in 9 ways as a sum of consecutive naturals, for example, 577 + ... + 2015.

2^1864944 is an apocalyptic number.

1864944 is the 864-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1864944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2700720).

1864944 is an abundant number, since it is smaller than the sum of its proper divisors (3536496).

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

1864944 is a wasteful number, since it uses less digits than its factorization.

1864944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459 (or 1444 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1864944 is about 1365.6295251641. The cubic root of 1864944 is about 123.0897619619.

The spelling of 1864944 in words is "one million, eight hundred sixty-four thousand, nine hundred forty-four".