1866490 has 8 divisors (see below), whose sum is σ = 3359700. Its totient is φ = 746592.

The previous prime is 1866467. The next prime is 1866499. The reversal of 1866490 is 946681.

It can be written as a sum of positive squares in 2 ways, for example, as 1692601 + 173889 = 1301^2 + 417^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1866499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93315 + ... + 93334.

2^1866490 is an apocalyptic number.

1866490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1866490 is a deficient number, since it is larger than the sum of its proper divisors (1493210).

1866490 is a wasteful number, since it uses less digits than its factorization.

1866490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186656.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1866490 is about 1366.1954472183. The cubic root of 1866490 is about 123.1237655231.

The spelling of 1866490 in words is "one million, eight hundred sixty-six thousand, four hundred ninety".