1861943 has 12 divisors (see below), whose sum is σ = 2044440. Its totient is φ = 1690416.

The previous prime is 1861927. The next prime is 1861961. The reversal of 1861943 is 3491681.

It is a happy number.

It is not a de Polignac number, because 1861943 - 2⁴ = 1861927 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35105 + ... + 35157.

It is an arithmetic number, because the mean of its divisors is an integer number (170370).

2^1861943 is an apocalyptic number.

1861943 is a deficient number, since it is larger than the sum of its proper divisors (182497).

1861943 is an equidigital number, since it uses as much as digits as its factorization.

1861943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 115 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 1861943 is about 1364.5303221255. The cubic root of 1861943 is about 123.0237026610.

The spelling of 1861943 in words is "one million, eight hundred sixty-one thousand, nine hundred forty-three".