123739445438 has 16 divisors (see below), whose sum is σ = 213475880544. Its totient is φ = 52693411680.

The previous prime is 123739445407. The next prime is 123739445443. The reversal of 123739445438 is 834544937321.

It is a super-2 number, since 2×123739445438² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123739445438.

It is a congruent number.

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, 28145993 + ... + 28150388.

It is an arithmetic number, because the mean of its divisors is an integer number (13342242534).

Almost surely, 2^123739445438 is an apocalyptic number.

123739445438 is a deficient number, since it is larger than the sum of its proper divisors (89736435106).

123739445438 is a wasteful number, since it uses less digits than its factorization.

123739445438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56296547.

The product of its digits is 8709120, while the sum is 53.

The spelling of 123739445438 in words is "one hundred twenty-three billion, seven hundred thirty-nine million, four hundred forty-five thousand, four hundred thirty-eight".