1890149 has 2 divisors, whose sum is σ = 1890150. Its totient is φ = 1890148.

The previous prime is 1890121. The next prime is 1890167. The reversal of 1890149 is 9410981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 669124 = 1105^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890149 - 2²⁰ = 841573 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1896149) 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, 945074 + 945075.

It is an arithmetic number, because the mean of its divisors is an integer number (945075).

2^1890149 is an apocalyptic number.

It is an amenable number.

1890149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890149 is an equidigital number, since it uses as much as digits as its factorization.

1890149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1890149 is about 1374.8268981948. The cubic root of 1890149 is about 123.6418079645.

The spelling of 1890149 in words is "one million, eight hundred ninety thousand, one hundred forty-nine".