1881620 has 24 divisors (see below), whose sum is σ = 4255944. Its totient is φ = 694656.

The previous prime is 1881619. The next prime is 1881631. The reversal of 1881620 is 261881.

It can be written as a sum of positive squares in 4 ways, for example, as 80656 + 1800964 = 284^2 + 1342^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 1881620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3359 + ... + 3878.

It is an arithmetic number, because the mean of its divisors is an integer number (177331).

2^1881620 is an apocalyptic number.

1881620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881620 is an abundant number, since it is smaller than the sum of its proper divisors (2374324).

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

1881620 is a wasteful number, since it uses less digits than its factorization.

1881620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259 (or 7257 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 1881620 is about 1371.7215460873. The cubic root of 1881620 is about 123.4555561366.

The spelling of 1881620 in words is "one million, eight hundred eighty-one thousand, six hundred twenty".