1881040 has 40 divisors (see below), whose sum is σ = 4999680. Its totient is φ = 644736.

The previous prime is 1881037. The next prime is 1881041. The reversal of 1881040 is 401881.

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

It is a super-2 number, since 2×1881040² = 7076622963200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120 + ... + 2239.

It is an arithmetic number, because the mean of its divisors is an integer number (124992).

2^1881040 is an apocalyptic number.

1881040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1881040 is the 1120-th pentagonal number.

It is an amenable number.

1881040 is an abundant number, since it is smaller than the sum of its proper divisors (3118640).

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

1881040 is a wasteful number, since it uses less digits than its factorization.

1881040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379 (or 3373 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1881040 is about 1371.5101166233. The cubic root of 1881040 is about 123.4428699795.

The spelling of 1881040 in words is "one million, eight hundred eighty-one thousand, forty".