123436399287 has 16 divisors (see below), whose sum is σ = 171815136768. Its totient is φ = 78677528160.

The previous prime is 123436399277. The next prime is 123436399301. The reversal of 123436399287 is 782993634321.

It is not a de Polignac number, because 123436399287 - 2¹⁰ = 123436398263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123436399277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249483 + ... + 555980.

It is an arithmetic number, because the mean of its divisors is an integer number (10738446048).

Almost surely, 2^123436399287 is an apocalyptic number.

123436399287 is a deficient number, since it is larger than the sum of its proper divisors (48378737481).

123436399287 is a wasteful number, since it uses less digits than its factorization.

123436399287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807710.

The product of its digits is 11757312, while the sum is 57.

The spelling of 123436399287 in words is "one hundred twenty-three billion, four hundred thirty-six million, three hundred ninety-nine thousand, two hundred eighty-seven".