1881720 has 48 divisors (see below), whose sum is σ = 6116760. Its totient is φ = 501696.

The previous prime is 1881697. The next prime is 1881749. The reversal of 1881720 is 271881.

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, 2254 + ... + 2973.

2^1881720 is an apocalyptic number.

1881720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881720 is an abundant number, since it is smaller than the sum of its proper divisors (4235040).

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

1881720 is a wasteful number, since it uses less digits than its factorization.

1881720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244 (or 5237 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1881720 is about 1371.7579961495. The cubic root of 1881720 is about 123.4577431416.

It can be divided in two parts, 1881 and 720, that added together give a square (2601 = 51²).

The spelling of 1881720 in words is "one million, eight hundred eighty-one thousand, seven hundred twenty".