1889819 has 2 divisors, whose sum is σ = 1889820. Its totient is φ = 1889818.

The previous prime is 1889803. The next prime is 1889831. The reversal of 1889819 is 9189881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1889819 - 2⁴ = 1889803 is a prime.

It is a super-2 number, since 2×1889819² = 7142831705522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1889819.

It is not a weakly prime, because it can be changed into another prime (1889219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944909 + 944910.

It is an arithmetic number, because the mean of its divisors is an integer number (944910).

2^1889819 is an apocalyptic number.

1889819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889819 is an equidigital number, since it uses as much as digits as its factorization.

1889819 is an evil number, because the sum of its binary digits is even.

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

The square root of 1889819 is about 1374.7068778471. The cubic root of 1889819 is about 123.6346120289.

The spelling of 1889819 in words is "one million, eight hundred eighty-nine thousand, eight hundred nineteen".