1861776 has 60 divisors (see below), whose sum is σ = 5957952. Its totient is φ = 531648.

The previous prime is 1861759. The next prime is 1861787. The reversal of 1861776 is 6771681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1861776.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85 + ... + 1931.

2^1861776 is an apocalyptic number.

1861776 is a gapful number since it is divisible by the number (16) 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 1861776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2978976).

1861776 is an abundant number, since it is smaller than the sum of its proper divisors (4096176).

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

1861776 is a wasteful number, since it uses less digits than its factorization.

1861776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868 (or 1859 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 1861776 is about 1364.4691275364. The cubic root of 1861776 is about 123.0200245011.

The spelling of 1861776 in words is "one million, eight hundred sixty-one thousand, seven hundred seventy-six".