1881840 has 40 divisors (see below), whose sum is σ = 5834448. Its totient is φ = 501760.

The previous prime is 1881823. The next prime is 1881851. The reversal of 1881840 is 481881.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1881798 and 1881807.

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, 3681 + ... + 4160.

2^1881840 is an apocalyptic number.

1881840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881840 is an abundant number, since it is smaller than the sum of its proper divisors (3952608).

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

1881840 is a wasteful number, since it uses less digits than its factorization.

1881840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7857 (or 7851 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 1881840 is about 1371.8017349457. The cubic root of 1881840 is about 123.4603674453.

The spelling of 1881840 in words is "one million, eight hundred eighty-one thousand, eight hundred forty".