1861080 has 64 divisors (see below), whose sum is σ = 6017760. Its totient is φ = 457728.

The previous prime is 1861061. The next prime is 1861081. The reversal of 1861080 is 801681.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1861080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 964 + ... + 2156.

2^1861080 is an apocalyptic number.

1861080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3008880).

1861080 is an abundant number, since it is smaller than the sum of its proper divisors (4156680).

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

1861080 is a wasteful number, since it uses less digits than its factorization.

1861080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220 (or 1216 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 1861080 is about 1364.2140594496. The cubic root of 1861080 is about 123.0046927947.

The spelling of 1861080 in words is "one million, eight hundred sixty-one thousand, eighty".