1890964469 has 2 divisors, whose sum is σ = 1890964470. Its totient is φ = 1890964468.

The previous prime is 1890964457. The next prime is 1890964499. The reversal of 1890964469 is 9644690981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1889032369 + 1932100 = 43463^2 + 1390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890964469 is a prime.

It is a super-2 number, since 2×1890964469² = 7151493246040903922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1890964429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945482234 + 945482235.

It is an arithmetic number, because the mean of its divisors is an integer number (945482235).

Almost surely, 2^1890964469 is an apocalyptic number.

It is an amenable number.

1890964469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890964469 is an equidigital number, since it uses as much as digits as its factorization.

1890964469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The square root of 1890964469 is about 43485.2212711399. The cubic root of 1890964469 is about 1236.5958638039.

The spelling of 1890964469 in words is "one billion, eight hundred ninety million, nine hundred sixty-four thousand, four hundred sixty-nine".