123684443837 has 2 divisors, whose sum is σ = 123684443838. Its totient is φ = 123684443836.

The previous prime is 123684443819. The next prime is 123684443863. The reversal of 123684443837 is 738344486321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86329604761 + 37354839076 = 293819^2 + 193274^2 .

It is a cyclic number.

It is not a de Polignac number, because 123684443837 - 2¹² = 123684439741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123684443537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61842221918 + 61842221919.

It is an arithmetic number, because the mean of its divisors is an integer number (61842221919).

Almost surely, 2^123684443837 is an apocalyptic number.

It is an amenable number.

123684443837 is a deficient number, since it is larger than the sum of its proper divisors (1).

123684443837 is an equidigital number, since it uses as much as digits as its factorization.

123684443837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 53.

The spelling of 123684443837 in words is "one hundred twenty-three billion, six hundred eighty-four million, four hundred forty-three thousand, eight hundred thirty-seven".