123512440389 has 8 divisors (see below), whose sum is σ = 177351196512. Its totient is φ = 76007655600.

The previous prime is 123512440357. The next prime is 123512440423. The reversal of 123512440389 is 983044215321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123512440389 - 2⁵ = 123512440357 is a prime.

It is a super-3 number, since 3×123512440389³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123512440389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123512440309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1583492787 + ... + 1583492864.

It is an arithmetic number, because the mean of its divisors is an integer number (22168899564).

Almost surely, 2^123512440389 is an apocalyptic number.

It is an amenable number.

123512440389 is a deficient number, since it is larger than the sum of its proper divisors (53838756123).

123512440389 is a wasteful number, since it uses less digits than its factorization.

123512440389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166985667.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 123512440389 in words is "one hundred twenty-three billion, five hundred twelve million, four hundred forty thousand, three hundred eighty-nine".