1881378 has 24 divisors (see below), whose sum is σ = 4113408. Its totient is φ = 621432.

The previous prime is 1881349. The next prime is 1881389. The reversal of 1881378 is 8731881.

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, 1875 + ... + 2697.

It is an arithmetic number, because the mean of its divisors is an integer number (171392).

2^1881378 is an apocalyptic number.

1881378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1881378 is an abundant number, since it is smaller than the sum of its proper divisors (2232030).

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

1881378 is a wasteful number, since it uses less digits than its factorization.

1881378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958 (or 955 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 1881378 is about 1371.6333329283. The cubic root of 1881378 is about 123.4502632639.

The spelling of 1881378 in words is "one million, eight hundred eighty-one thousand, three hundred seventy-eight".