123670421 has 4 divisors (see below), whose sum is σ = 141337632. Its totient is φ = 106003212.

The previous prime is 123670397. The next prime is 123670433. The reversal of 123670421 is 124076321.

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 de Polignac number, because none of the positive numbers 2^k-123670421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123670621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8833595 + ... + 8833608.

It is an arithmetic number, because the mean of its divisors is an integer number (35334408).

Almost surely, 2^123670421 is an apocalyptic number.

It is an amenable number.

123670421 is a deficient number, since it is larger than the sum of its proper divisors (17667211).

123670421 is an equidigital number, since it uses as much as digits as its factorization.

123670421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17667210.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 123670421 is about 11120.7203453733. The cubic root of 123670421 is about 498.2209051512.

The spelling of 123670421 in words is "one hundred twenty-three million, six hundred seventy thousand, four hundred twenty-one".