1866442 has 4 divisors (see below), whose sum is σ = 2799666. Its totient is φ = 933220.

The previous prime is 1866439. The next prime is 1866451. The reversal of 1866442 is 2446681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2446681 = 1283 ⋅1907.

It can be written as a sum of positive squares in only one way, i.e., 1615441 + 251001 = 1271^2 + 501^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466609 + ... + 466612.

2^1866442 is an apocalyptic number.

1866442 is a deficient number, since it is larger than the sum of its proper divisors (933224).

1866442 is an equidigital number, since it uses as much as digits as its factorization.

1866442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933223.

The product of its digits is 9216, while the sum is 31.

The square root of 1866442 is about 1366.1778800727. The cubic root of 1866442 is about 123.1227100676.

The spelling of 1866442 in words is "one million, eight hundred sixty-six thousand, four hundred forty-two".