123342820987 has 4 divisors (see below), whose sum is σ = 127321621696. Its totient is φ = 119364020280.

The previous prime is 123342820973. The next prime is 123342821023. The reversal of 123342820987 is 789028243321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789028243321 = 6113 ⋅129073817.

It is a cyclic number.

It is not a de Polignac number, because 123342820987 - 2¹⁹ = 123342296699 is a prime.

It is a super-2 number, since 2×123342820987² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123342820987.

It is not an unprimeable number, because it can be changed into a prime (123342820907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1989400308 + ... + 1989400369.

It is an arithmetic number, because the mean of its divisors is an integer number (31830405424).

Almost surely, 2^123342820987 is an apocalyptic number.

123342820987 is a deficient number, since it is larger than the sum of its proper divisors (3978800709).

123342820987 is an equidigital number, since it uses as much as digits as its factorization.

123342820987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978800708.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 123342820987 in words is "one hundred twenty-three billion, three hundred forty-two million, eight hundred twenty thousand, nine hundred eighty-seven".