1881899 has 2 divisors, whose sum is σ = 1881900. Its totient is φ = 1881898.

The previous prime is 1881889. The next prime is 1881907. The reversal of 1881899 is 9981881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1881889) 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 as a sum of consecutive naturals, namely, 940949 + 940950.

It is an arithmetic number, because the mean of its divisors is an integer number (940950).

2^1881899 is an apocalyptic number.

1881899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881899 is an equidigital number, since it uses as much as digits as its factorization.

1881899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 44.

The square root of 1881899 is about 1371.8232393424. The cubic root of 1881899 is about 123.4616576871.

The spelling of 1881899 in words is "one million, eight hundred eighty-one thousand, eight hundred ninety-nine".