123620905 has 8 divisors (see below), whose sum is σ = 148449600. Its totient is φ = 98827056.

The previous prime is 123620873. The next prime is 123620921. The reversal of 123620905 is 509026321.

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 123620905 - 2⁵ = 123620873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135 + ... + 15724.

It is an arithmetic number, because the mean of its divisors is an integer number (18556200).

Almost surely, 2^123620905 is an apocalyptic number.

It is an amenable number.

123620905 is a deficient number, since it is larger than the sum of its proper divisors (24828695).

123620905 is a wasteful number, since it uses less digits than its factorization.

123620905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17423.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 123620905 is about 11118.4938278528. The cubic root of 123620905 is about 498.1544025891.

The spelling of 123620905 in words is "one hundred twenty-three million, six hundred twenty thousand, nine hundred five".