123506427986 has 16 divisors (see below), whose sum is σ = 190875965400. Its totient is φ = 59907289728.

The previous prime is 123506427971. The next prime is 123506427991. The reversal of 123506427986 is 689724605321.

It can be written as a sum of positive squares in 4 ways, for example, as 112011371761 + 11495056225 = 334681^2 + 107215^2 .

It is a super-2 number, since 2×123506427986² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6536381 + ... + 6555248.

It is a 1-persistent number, because it is pandigital, but 2⋅123506427986 = 247012855972 is not.

Almost surely, 2^123506427986 is an apocalyptic number.

123506427986 is a deficient number, since it is larger than the sum of its proper divisors (67369537414).

123506427986 is a wasteful number, since it uses less digits than its factorization.

123506427986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13091773.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 123506427986 in words is "one hundred twenty-three billion, five hundred six million, four hundred twenty-seven thousand, nine hundred eighty-six".