123438599377 has 4 divisors (see below), whose sum is σ = 130699693476. Its totient is φ = 116177505280.

The previous prime is 123438599363. The next prime is 123438599399. The reversal of 123438599377 is 773995834321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96844817601 + 26593781776 = 311199^2 + 163076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123438599377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123438599077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3630547024 + ... + 3630547057.

It is an arithmetic number, because the mean of its divisors is an integer number (32674923369).

Almost surely, 2^123438599377 is an apocalyptic number.

123438599377 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

123438599377 is a deficient number, since it is larger than the sum of its proper divisors (7261094099).

123438599377 is an equidigital number, since it uses as much as digits as its factorization.

123438599377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7261094098.

The product of its digits is 34292160, while the sum is 61.

The spelling of 123438599377 in words is "one hundred twenty-three billion, four hundred thirty-eight million, five hundred ninety-nine thousand, three hundred seventy-seven".