1788881 has 2 divisors, whose sum is σ = 1788882. Its totient is φ = 1788880.

The previous prime is 1788863. The next prime is 1788901. The reversal of 1788881 is 1888871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 707281 = 1040^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1788881 - 2¹⁴ = 1772497 is a prime.

It is a super-2 number, since 2×1788881² = 6400190464322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1781881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 894440 + 894441.

It is an arithmetic number, because the mean of its divisors is an integer number (894441).

2^1788881 is an apocalyptic number.

It is an amenable number.

1788881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1788881 is an equidigital number, since it uses as much as digits as its factorization.

1788881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28672, while the sum is 41.

The square root of 1788881 is about 1337.4905607144. The cubic root of 1788881 is about 121.3930483007.

The spelling of 1788881 in words is "one million, seven hundred eighty-eight thousand, eight hundred eighty-one".