123493907889 has 81 divisors (see below), whose sum is σ = 205409780121. Its totient is φ = 71436047760.

The previous prime is 123493907879. The next prime is 123493907917. The reversal of 123493907889 is 988709394321.

The square root of 123493907889 is 351417.

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

123493907889 is a `hidden beast` number, since 1 + 234 + 9 + 390 + 7 + 8 + 8 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-123493907889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123493907879) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 266725272 + ... + 266725734.

Almost surely, 2^123493907889 is an apocalyptic number.

123493907889 is the 351417-th square number.

123493907889 is the 175709-th centered octagonal number.

It is an amenable number.

123493907889 is a deficient number, since it is larger than the sum of its proper divisors (81915872232).

123493907889 is an equidigital number, since it uses as much as digits as its factorization.

123493907889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 500 counting only the distinct ones).

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

The spelling of 123493907889 in words is "one hundred twenty-three billion, four hundred ninety-three million, nine hundred seven thousand, eight hundred eighty-nine".