123687445447 has 4 divisors (see below), whose sum is σ = 127030349416. Its totient is φ = 120344541480.

The previous prime is 123687445439. The next prime is 123687445451. The reversal of 123687445447 is 744544786321.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 123687445447 - 2³ = 123687445439 is a prime.

It is a super-2 number, since 2×123687445447² (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 (123687445477) 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, 1671451929 + ... + 1671452002.

It is an arithmetic number, because the mean of its divisors is an integer number (31757587354).

Almost surely, 2^123687445447 is an apocalyptic number.

123687445447 is a deficient number, since it is larger than the sum of its proper divisors (3342903969).

123687445447 is an equidigital number, since it uses as much as digits as its factorization.

123687445447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342903968.

The product of its digits is 18063360, while the sum is 55.

The spelling of 123687445447 in words is "one hundred twenty-three billion, six hundred eighty-seven million, four hundred forty-five thousand, four hundred forty-seven".