1890019 has 2 divisors, whose sum is σ = 1890020. Its totient is φ = 1890018.

The previous prime is 1889999. The next prime is 1890023. The reversal of 1890019 is 9100981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1890019 - 2¹⁷ = 1758947 is a prime.

It is a super-2 number, since 2×1890019² = 7144343640722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1890029) 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, 945009 + 945010.

It is an arithmetic number, because the mean of its divisors is an integer number (945010).

2^1890019 is an apocalyptic number.

1890019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890019 is an equidigital number, since it uses as much as digits as its factorization.

1890019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1890019 is about 1374.7796187026. The cubic root of 1890019 is about 123.6389733020.

The spelling of 1890019 in words is "one million, eight hundred ninety thousand, nineteen".