123972785 has 8 divisors (see below), whose sum is σ = 150132840. Its totient is φ = 98267904.

The previous prime is 123972781. The next prime is 123972787. The reversal of 123972785 is 587279321.

It can be written as a sum of positive squares in 4 ways, for example, as 8904256 + 115068529 = 2984^2 + 10727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123972785 - 2² = 123972781 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123972781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113192 + ... + 114281.

It is an arithmetic number, because the mean of its divisors is an integer number (18766605).

Almost surely, 2^123972785 is an apocalyptic number.

It is an amenable number.

123972785 is a deficient number, since it is larger than the sum of its proper divisors (26160055).

123972785 is a wasteful number, since it uses less digits than its factorization.

123972785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227587.

The product of its digits is 211680, while the sum is 44.

The square root of 123972785 is about 11134.3066690297. The cubic root of 123972785 is about 498.6266110596.

The spelling of 123972785 in words is "one hundred twenty-three million, nine hundred seventy-two thousand, seven hundred eighty-five".