123445989 has 12 divisors (see below), whose sum is σ = 178483500. Its totient is φ = 82217664.

The previous prime is 123445979. The next prime is 123445997. The reversal of 123445989 is 989544321.

123445989 is a `hidden beast` number, since 12 + 3 + 44 + 598 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 72080100 + 51365889 = 8490^2 + 7167^2 .

It is not a de Polignac number, because 123445989 - 2⁹ = 123445477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123445909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4087 + ... + 16235.

It is an arithmetic number, because the mean of its divisors is an integer number (14873625).

Almost surely, 2^123445989 is an apocalyptic number.

It is an amenable number.

123445989 is a deficient number, since it is larger than the sum of its proper divisors (55037511).

123445989 is a wasteful number, since it uses less digits than its factorization.

123445989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13284 (or 13281 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 123445989 is about 11110.6250499241. The cubic root of 123445989 is about 497.9193390433.

The spelling of 123445989 in words is "one hundred twenty-three million, four hundred forty-five thousand, nine hundred eighty-nine".