1893896163721 has 9 divisors (see below), whose sum is σ = 1998848755533. Its totient is φ = 1794192646860.

The previous prime is 1893896163689. The next prime is 1893896163751. The reversal of 1893896163721 is 1273616983981.

The square root of 1893896163721 is 1376189.

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

It is not a de Polignac number, because 1893896163721 - 2⁵ = 1893896163689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1893896163751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26111376 + ... + 26183806.

Almost surely, 2^{1893896163721} is an apocalyptic number.

1893896163721 is the 1376189-th square number.

1893896163721 is the 688095-th centered octagonal number.

It is an amenable number.

1893896163721 is a deficient number, since it is larger than the sum of its proper divisors (104952591812).

1893896163721 is an frugal number, since it uses more digits than its factorization.

1893896163721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144900 (or 72450 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 64.

Multiplying 1893896163721 by its sum of digits (64), we get a square (121209354478144 = 11009512²).

The spelling of 1893896163721 in words is "one trillion, eight hundred ninety-three billion, eight hundred ninety-six million, one hundred sixty-three thousand, seven hundred twenty-one".