1993893911 has 4 divisors (see below), whose sum is σ = 1997580024. Its totient is φ = 1990207800.

The previous prime is 1993893859. The next prime is 1993893947. The reversal of 1993893911 is 1193983991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1193983991 = 2861 ⋅417331.

It is a cyclic number.

It is not a de Polignac number, because 1993893911 - 2¹⁴ = 1993877527 is a prime.

It is a super-2 number, since 2×1993893911² = 7951225856645751842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993893211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1842245 + ... + 1843326.

It is an arithmetic number, because the mean of its divisors is an integer number (499395006).

Almost surely, 2^1993893911 is an apocalyptic number.

1993893911 is a deficient number, since it is larger than the sum of its proper divisors (3686113).

1993893911 is an equidigital number, since it uses as much as digits as its factorization.

1993893911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686112.

The product of its digits is 472392, while the sum is 53.

The square root of 1993893911 is about 44653.0392134735. The cubic root of 1993893911 is about 1258.6375444636.

The spelling of 1993893911 in words is "one billion, nine hundred ninety-three million, eight hundred ninety-three thousand, nine hundred eleven".