123285257 has 4 divisors (see below), whose sum is σ = 126152400. Its totient is φ = 120418116.

The previous prime is 123285251. The next prime is 123285259. The reversal of 123285257 is 752582321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752582321 = 71 ⋅10599751.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123285257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123285251) 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, 1433507 + ... + 1433592.

It is an arithmetic number, because the mean of its divisors is an integer number (31538100).

Almost surely, 2^123285257 is an apocalyptic number.

It is an amenable number.

123285257 is a deficient number, since it is larger than the sum of its proper divisors (2867143).

123285257 is an equidigital number, since it uses as much as digits as its factorization.

123285257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867142.

The product of its digits is 33600, while the sum is 35.

The square root of 123285257 is about 11103.3894374646. The cubic root of 123285257 is about 497.7031410341.

The spelling of 123285257 in words is "one hundred twenty-three million, two hundred eighty-five thousand, two hundred fifty-seven".