123509887 has 4 divisors (see below), whose sum is σ = 123805080. Its totient is φ = 123214696.

The previous prime is 123509873. The next prime is 123509929. The reversal of 123509887 is 788905321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788905321 = 137 ⋅5758433.

It is a cyclic number.

It is not a de Polignac number, because 123509887 - 2¹⁵ = 123477119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123509807) 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, 146968 + ... + 147805.

It is an arithmetic number, because the mean of its divisors is an integer number (30951270).

Almost surely, 2^123509887 is an apocalyptic number.

123509887 is a deficient number, since it is larger than the sum of its proper divisors (295193).

123509887 is an equidigital number, since it uses as much as digits as its factorization.

123509887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295192.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 123509887 is about 11113.5002137041. The cubic root of 123509887 is about 498.0052350756.

The spelling of 123509887 in words is "one hundred twenty-three million, five hundred nine thousand, eight hundred eighty-seven".