1799989123 has 4 divisors (see below), whose sum is σ = 1802789128. Its totient is φ = 1797189120.

The previous prime is 1799989097. The next prime is 1799989129. The reversal of 1799989123 is 3219899971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3219899971 = 31 ⋅103867741.

It is a cyclic number.

It is not a de Polignac number, because 1799989123 - 2²¹ = 1797891971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1799989129) 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, 1399038 + ... + 1400323.

It is an arithmetic number, because the mean of its divisors is an integer number (450697282).

Almost surely, 2^1799989123 is an apocalyptic number.

1799989123 is a deficient number, since it is larger than the sum of its proper divisors (2800005).

1799989123 is an equidigital number, since it uses as much as digits as its factorization.

1799989123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800004.

The product of its digits is 2204496, while the sum is 58.

The square root of 1799989123 is about 42426.2786843249. The cubic root of 1799989123 is about 1216.4379488834.

The spelling of 1799989123 in words is "one billion, seven hundred ninety-nine million, nine hundred eighty-nine thousand, one hundred twenty-three".