123975949 has 4 divisors (see below), whose sum is σ = 124029180. Its totient is φ = 123922720.

The previous prime is 123975889. The next prime is 123975997. The reversal of 123975949 is 949579321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8305924 + 115670025 = 2882^2 + 10755^2 .

It is a cyclic number.

It is not a de Polignac number, because 123975949 - 2¹⁵ = 123943181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123972949) 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, 22954 + ... + 27835.

It is an arithmetic number, because the mean of its divisors is an integer number (31007295).

Almost surely, 2^123975949 is an apocalyptic number.

It is an amenable number.

123975949 is a deficient number, since it is larger than the sum of its proper divisors (53231).

123975949 is an equidigital number, since it uses as much as digits as its factorization.

123975949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53230.

The product of its digits is 612360, while the sum is 49.

The square root of 123975949 is about 11134.4487515099. The cubic root of 123975949 is about 498.6308529615.

The spelling of 123975949 in words is "one hundred twenty-three million, nine hundred seventy-five thousand, nine hundred forty-nine".