1865216 has 20 divisors (see below), whose sum is σ = 3727812. Its totient is φ = 932352.

The previous prime is 1865203. The next prime is 1865221. The reversal of 1865216 is 6125681.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310 + ... + 2333.

2^1865216 is an apocalyptic number.

1865216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1865216 is a deficient number, since it is larger than the sum of its proper divisors (1862596).

1865216 is an frugal number, since it uses more digits than its factorization.

1865216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661 (or 3645 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1865216 is about 1365.7291093039. The cubic root of 1865216 is about 123.0957458391.

The spelling of 1865216 in words is "one million, eight hundred sixty-five thousand, two hundred sixteen".