1881240 has 64 divisors (see below), whose sum is σ = 5758560. Its totient is φ = 491520.

The previous prime is 1881223. The next prime is 1881241. The reversal of 1881240 is 421881.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1881240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7192 + ... + 7448.

2^1881240 is an apocalyptic number.

1881240 is a gapful number since it is divisible by the number (10) 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 1881240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2879280).

1881240 is an abundant number, since it is smaller than the sum of its proper divisors (3877320).

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

1881240 is a wasteful number, since it uses less digits than its factorization.

1881240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1881240 is about 1371.5830270166. The cubic root of 1881240 is about 123.4472448110.

The spelling of 1881240 in words is "one million, eight hundred eighty-one thousand, two hundred forty".