1866393 has 6 divisors (see below), whose sum is σ = 2695914. Its totient is φ = 1244256.

The previous prime is 1866373. The next prime is 1866409. The reversal of 1866393 is 3936681.

It is a happy number.

1866393 is a `hidden beast` number, since 18 + 6 + 639 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1814409 + 51984 = 1347^2 + 228^2 .

It is not a de Polignac number, because 1866393 - 2⁹ = 1865881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1866343) 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, 103680 + ... + 103697.

It is an arithmetic number, because the mean of its divisors is an integer number (449319).

2^1866393 is an apocalyptic number.

It is an amenable number.

1866393 is a deficient number, since it is larger than the sum of its proper divisors (829521).

1866393 is a wasteful number, since it uses less digits than its factorization.

1866393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207383 (or 207380 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1866393 is about 1366.1599467120. The cubic root of 1866393 is about 123.1216326048.

The spelling of 1866393 in words is "one million, eight hundred sixty-six thousand, three hundred ninety-three".