123739445437 has 4 divisors (see below), whose sum is σ = 123838517500. Its totient is φ = 123640373376.

The previous prime is 123739445407. The next prime is 123739445443. The reversal of 123739445437 is 734544937321.

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 89117772676 + 34621672761 = 298526^2 + 186069^2 .

It is a cyclic number.

It is not a de Polignac number, because 123739445437 - 2¹⁵ = 123739412669 is a prime.

It is a super-2 number, since 2×123739445437² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123739445407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49534158 + ... + 49536655.

It is an arithmetic number, because the mean of its divisors is an integer number (30959629375).

Almost surely, 2^123739445437 is an apocalyptic number.

It is an amenable number.

123739445437 is a deficient number, since it is larger than the sum of its proper divisors (99072063).

123739445437 is an equidigital number, since it uses as much as digits as its factorization.

123739445437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99072062.

The product of its digits is 7620480, while the sum is 52.

The spelling of 123739445437 in words is "one hundred twenty-three billion, seven hundred thirty-nine million, four hundred forty-five thousand, four hundred thirty-seven".