1865506 has 8 divisors (see below), whose sum is σ = 2833920. Its totient is φ = 920868.

The previous prime is 1865491. The next prime is 1865509. The reversal of 1865506 is 6055681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1865506² = 6960225272072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1865509) 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 3 ways as a sum of consecutive naturals, for example, 5746 + ... + 6061.

It is an arithmetic number, because the mean of its divisors is an integer number (354240).

2^1865506 is an apocalyptic number.

1865506 is a deficient number, since it is larger than the sum of its proper divisors (968414).

1865506 is a wasteful number, since it uses less digits than its factorization.

1865506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11888.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1865506 is about 1365.8352755732. The cubic root of 1865506 is about 123.1021250675.

The spelling of 1865506 in words is "one million, eight hundred sixty-five thousand, five hundred six".