123475721 has 4 divisors (see below), whose sum is σ = 126102912. Its totient is φ = 120848532.

The previous prime is 123475717. The next prime is 123475727. The reversal of 123475721 is 127574321.

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.

It is a cyclic number.

It is not a de Polignac number, because 123475721 - 2² = 123475717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123475727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313525 + ... + 1313618.

It is an arithmetic number, because the mean of its divisors is an integer number (31525728).

Almost surely, 2^123475721 is an apocalyptic number.

It is an amenable number.

123475721 is a deficient number, since it is larger than the sum of its proper divisors (2627191).

123475721 is an equidigital number, since it uses as much as digits as its factorization.

123475721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627190.

The product of its digits is 11760, while the sum is 32.

The square root of 123475721 is about 11111.9629679009. The cubic root of 123475721 is about 497.9593105038.

The spelling of 123475721 in words is "one hundred twenty-three million, four hundred seventy-five thousand, seven hundred twenty-one".