1890697 has 2 divisors, whose sum is σ = 1890698. Its totient is φ = 1890696.

The previous prime is 1890677. The next prime is 1890701. The reversal of 1890697 is 7960981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1798281 + 92416 = 1341^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890697 - 2¹⁵ = 1857929 is a prime.

1890697 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1890617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945348 + 945349.

It is an arithmetic number, because the mean of its divisors is an integer number (945349).

2^1890697 is an apocalyptic number.

It is an amenable number.

1890697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890697 is an equidigital number, since it uses as much as digits as its factorization.

1890697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1890697 is about 1375.0261815689. The cubic root of 1890697 is about 123.6537557287.

The spelling of 1890697 in words is "one million, eight hundred ninety thousand, six hundred ninety-seven".