1861728 has 96 divisors (see below), whose sum is σ = 5588352. Its totient is φ = 537600.

The previous prime is 1861711. The next prime is 1861747. The reversal of 1861728 is 8271681.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1861728² = 6932062291968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43275 + ... + 43317.

It is an arithmetic number, because the mean of its divisors is an integer number (58212).

2^1861728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2794176).

1861728 is an abundant number, since it is smaller than the sum of its proper divisors (3726624).

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

1861728 is a wasteful number, since it uses less digits than its factorization.

1861728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 100 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 1861728 is about 1364.4515381647. The cubic root of 1861728 is about 123.0189672647.

The spelling of 1861728 in words is "one million, eight hundred sixty-one thousand, seven hundred twenty-eight".