1869444 has 18 divisors (see below), whose sum is σ = 4725630. Its totient is φ = 623136.

The previous prime is 1869443. The next prime is 1869449. The reversal of 1869444 is 4449681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1855044 + 14400 = 1362^2 + 120^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 51929 = 1869444 / (1 + 8 + 6 + 9 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 1869399 and 1869408.

It is not an unprimeable number, because it can be changed into a prime (1869443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25929 + ... + 26000.

It is an arithmetic number, because the mean of its divisors is an integer number (262535).

2^1869444 is an apocalyptic number.

It is an amenable number.

1869444 is an abundant number, since it is smaller than the sum of its proper divisors (2856186).

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

1869444 is a wasteful number, since it uses less digits than its factorization.

1869444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51939 (or 51934 counting only the distinct ones).

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

The square root of 1869444 is about 1367.2761242704. The cubic root of 1869444 is about 123.1886852205.

The spelling of 1869444 in words is "one million, eight hundred sixty-nine thousand, four hundred forty-four".