1861439 has 4 divisors (see below), whose sum is σ = 1876224. Its totient is φ = 1846656.

The previous prime is 1861417. The next prime is 1861469. The reversal of 1861439 is 9341681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1861439 - 2¹² = 1857343 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861469) 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, 7202 + ... + 7455.

It is an arithmetic number, because the mean of its divisors is an integer number (469056).

2^1861439 is an apocalyptic number.

1861439 is a deficient number, since it is larger than the sum of its proper divisors (14785).

1861439 is a wasteful number, since it uses less digits than its factorization.

1861439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14784.

The product of its digits is 5184, while the sum is 32.

The square root of 1861439 is about 1364.3456306963. The cubic root of 1861439 is about 123.0126014366.

The spelling of 1861439 in words is "one million, eight hundred sixty-one thousand, four hundred thirty-nine".