1861884 has 18 divisors (see below), whose sum is σ = 4706520. Its totient is φ = 620616.

The previous prime is 1861879. The next prime is 1861889. The reversal of 1861884 is 4881681.

It is an interprime number because it is at equal distance from previous prime (1861879) and next prime (1861889).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1861884² = 6933224058912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 51719 = 1861884 / (1 + 8 + 6 + 1 + 8 + 8 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861889) 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, 25824 + ... + 25895.

2^1861884 is an apocalyptic number.

It is an amenable number.

1861884 is an abundant number, since it is smaller than the sum of its proper divisors (2844636).

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

1861884 is a wasteful number, since it uses less digits than its factorization.

1861884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51729 (or 51724 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 1861884 is about 1364.5087027938. The cubic root of 1861884 is about 123.0224032165.

The spelling of 1861884 in words is "one million, eight hundred sixty-one thousand, eight hundred eighty-four".