1890193274649 has 27 divisors (see below), whose sum is σ = 2756677907893. Its totient is φ = 1248060477912.

The previous prime is 1890193274579. The next prime is 1890193274653. The reversal of 1890193274649 is 9464723910981.

The square root of 1890193274649 is 1374843.

It is a perfect power (a square), and thus also a powerful number.

1890193274649 is a `hidden beast` number, since 1 + 89 + 0 + 1 + 93 + 2 + 7 + 464 + 9 = 666.

It is not a de Polignac number, because 1890193274649 - 2⁷ = 1890193274521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1890193274699) 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 in 26 ways as a sum of consecutive naturals, for example, 441322462 + ... + 441326744.

Almost surely, 2^{1890193274649} is an apocalyptic number.

1890193274649 is the 1374843-rd square number.

1890193274649 is the 687422-nd centered octagonal number.

It is an amenable number.

1890193274649 is a deficient number, since it is larger than the sum of its proper divisors (866484633244).

1890193274649 is an frugal number, since it uses more digits than its factorization.

1890193274649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8786 (or 4393 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 1890193274649 in words is "one trillion, eight hundred ninety billion, one hundred ninety-three million, two hundred seventy-four thousand, six hundred forty-nine".