1881801 has 6 divisors (see below), whose sum is σ = 2718170. Its totient is φ = 1254528.

The previous prime is 1881799. The next prime is 1881811. The reversal of 1881801 is 1081881.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 331776 = 1245^2 + 576^2 .

It is not a de Polignac number, because 1881801 - 2¹ = 1881799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104536 + ... + 104553.

2^1881801 is an apocalyptic number.

It is an amenable number.

1881801 is a deficient number, since it is larger than the sum of its proper divisors (836369).

1881801 is a wasteful number, since it uses less digits than its factorization.

1881801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209095 (or 209092 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 1881801 is about 1371.7875199899. The cubic root of 1881801 is about 123.4595145588.

The spelling of 1881801 in words is "one million, eight hundred eighty-one thousand, eight hundred one".