1866138 has 32 divisors (see below), whose sum is σ = 3932160. Its totient is φ = 589680.

The previous prime is 1866131. The next prime is 1866143. The reversal of 1866138 is 8316681.

1866138 is a modest number, since divided by 6138 gives 186 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1866099 and 1866108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14631 + ... + 14757.

It is an arithmetic number, because the mean of its divisors is an integer number (122880).

2^1866138 is an apocalyptic number.

1866138 is an abundant number, since it is smaller than the sum of its proper divisors (2066022).

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

1866138 is a wasteful number, since it uses less digits than its factorization.

1866138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242.

The product of its digits is 6912, while the sum is 33.

The square root of 1866138 is about 1366.0666162380. The cubic root of 1866138 is about 123.1160250959.

The spelling of 1866138 in words is "one million, eight hundred sixty-six thousand, one hundred thirty-eight".