123409285 has 4 divisors (see below), whose sum is σ = 148091148. Its totient is φ = 98727424.

The previous prime is 123409277. The next prime is 123409333. The reversal of 123409285 is 582904321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 582904321 = 29 ⋅20100149.

It can be written as a sum of positive squares in 2 ways, for example, as 41705764 + 81703521 = 6458^2 + 9039^2 .

It is a cyclic number.

It is not a de Polignac number, because 123409285 - 2³ = 123409277 is a prime.

It is a super-2 number, since 2×123409285² = 30459703248422450, which 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 123409285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12340924 + ... + 12340933.

It is an arithmetic number, because the mean of its divisors is an integer number (37022787).

Almost surely, 2^123409285 is an apocalyptic number.

It is an amenable number.

123409285 is a deficient number, since it is larger than the sum of its proper divisors (24681863).

123409285 is an equidigital number, since it uses as much as digits as its factorization.

123409285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24681862.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 123409285 is about 11108.9731748708. The cubic root of 123409285 is about 497.8699856293.

The spelling of 123409285 in words is "one hundred twenty-three million, four hundred nine thousand, two hundred eighty-five".