1890947169 has 6 divisors (see below), whose sum is σ = 2731368146. Its totient is φ = 1260631440.

The previous prime is 1890947167. The next prime is 1890947173. The reversal of 1890947169 is 9617490981.

It can be written as a sum of positive squares in only one way, i.e., 1630544400 + 260402769 = 40380^2 + 16137^2 .

It is not a de Polignac number, because 1890947169 - 2¹ = 1890947167 is a prime.

It is a super-2 number, since 2×1890947169² = 7151362391898229122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1890947167) 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 in 5 ways as a sum of consecutive naturals, for example, 105052612 + ... + 105052629.

Almost surely, 2^1890947169 is an apocalyptic number.

It is an amenable number.

1890947169 is a deficient number, since it is larger than the sum of its proper divisors (840420977).

1890947169 is a wasteful number, since it uses less digits than its factorization.

1890947169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210105247 (or 210105244 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 1890947169 is about 43485.0223525296. The cubic root of 1890947169 is about 1236.5920926818.

The spelling of 1890947169 in words is "one billion, eight hundred ninety million, nine hundred forty-seven thousand, one hundred sixty-nine".