1881901 has 4 divisors (see below), whose sum is σ = 2150752. Its totient is φ = 1613052.

The previous prime is 1881899. The next prime is 1881907. The reversal of 1881901 is 1091881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1881901 - 2¹ = 1881899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134415 + ... + 134428.

It is an arithmetic number, because the mean of its divisors is an integer number (537688).

2^1881901 is an apocalyptic number.

It is an amenable number.

1881901 is a deficient number, since it is larger than the sum of its proper divisors (268851).

1881901 is an equidigital number, since it uses as much as digits as its factorization.

1881901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268850.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1881901 is about 1371.8239682991. The cubic root of 1881901 is about 123.4617014236.

It can be divided in two parts, 188190 and 1, that added together give a triangular number (188191 = T₆₁₃).

The spelling of 1881901 in words is "one million, eight hundred eighty-one thousand, nine hundred one".