1993964923 has 4 divisors (see below), whose sum is σ = 2022049008. Its totient is φ = 1965880840.

The previous prime is 1993964909. The next prime is 1993964941. The reversal of 1993964923 is 3294693991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3294693991 = 19559 ⋅168449.

It is a cyclic number.

It is not a de Polignac number, because 1993964923 - 2⁹ = 1993964411 is a prime.

It is a super-2 number, since 2×1993964923² = 7951792228308791858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993964953) 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, 14041936 + ... + 14042077.

It is an arithmetic number, because the mean of its divisors is an integer number (505512252).

Almost surely, 2^1993964923 is an apocalyptic number.

1993964923 is a deficient number, since it is larger than the sum of its proper divisors (28084085).

1993964923 is an equidigital number, since it uses as much as digits as its factorization.

1993964923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28084084.

The product of its digits is 2834352, while the sum is 55.

The square root of 1993964923 is about 44653.8343594366. The cubic root of 1993964923 is about 1258.6524862998.

The spelling of 1993964923 in words is "one billion, nine hundred ninety-three million, nine hundred sixty-four thousand, nine hundred twenty-three".