123647421 has 16 divisors (see below), whose sum is σ = 176486400. Its totient is φ = 76767408.

The previous prime is 123647411. The next prime is 123647429. The reversal of 123647421 is 124746321.

It is not a de Polignac number, because 123647421 - 2⁹ = 123646909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123647429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15021 + ... + 21746.

It is an arithmetic number, because the mean of its divisors is an integer number (11030400).

Almost surely, 2^123647421 is an apocalyptic number.

It is an amenable number.

123647421 is a deficient number, since it is larger than the sum of its proper divisors (52838979).

123647421 is a wasteful number, since it uses less digits than its factorization.

123647421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36848.

The product of its digits is 8064, while the sum is 30.

The square root of 123647421 is about 11119.6861916153. The cubic root of 123647421 is about 498.1900171637.

The spelling of 123647421 in words is "one hundred twenty-three million, six hundred forty-seven thousand, four hundred twenty-one".