123587689 has 3 divisors (see below), whose sum is σ = 123598807. Its totient is φ = 123576572.

The previous prime is 123587677. The next prime is 123587729. The reversal of 123587689 is 986785321.

The square root of 123587689 is 11117.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 110082064 = 3675^2 + 10492^2 .

It is a de Polignac number, because none of the positive numbers 2^k-123587689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123527689) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5559 + ... + 16675.

Almost surely, 2^123587689 is an apocalyptic number.

123587689 is the 11117-th square number.

123587689 is the 5559-th centered octagonal number.

It is an amenable number.

123587689 is a deficient number, since it is larger than the sum of its proper divisors (11118).

123587689 is an frugal number, since it uses more digits than its factorization.

123587689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22234 (or 11117 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The cubic root of 123587689 is about 498.1097818220.

Multiplying 123587689 by its sum of digits (49), we get a square (6055796761 = 77819²).

The spelling of 123587689 in words is "one hundred twenty-three million, five hundred eighty-seven thousand, six hundred eighty-nine".