1865836 has 24 divisors (see below), whose sum is σ = 3834656. Its totient is φ = 777600.

The previous prime is 1865827. The next prime is 1865837. The reversal of 1865836 is 6385681.

1865836 = T₄₁₁ + T₄₁₂ + ... + T₄₃₁.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 1865795 and 1865804.

It is not an unprimeable number, because it can be changed into a prime (1865837) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 136 + ... + 1936.

2^1865836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1865836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1917328).

1865836 is an abundant number, since it is smaller than the sum of its proper divisors (1968820).

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

1865836 is a wasteful number, since it uses less digits than its factorization.

1865836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1847 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 1865836 is about 1365.9560754285. The cubic root of 1865836 is about 123.1093833853.

It can be divided in two parts, 1865 and 836, that added together give a triangular number (2701 = T₇₃).

The spelling of 1865836 in words is "one million, eight hundred sixty-five thousand, eight hundred thirty-six".