7129423 has 4 divisors (see below), whose sum is σ = 8147920. Its totient is φ = 6110928.

The previous prime is 7129417. The next prime is 7129439. The reversal of 7129423 is 3249217.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7129423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7129391 and 7129400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7129453) 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, 509238 + ... + 509251.

It is an arithmetic number, because the mean of its divisors is an integer number (2036980).

Almost surely, 2^7129423 is an apocalyptic number.

7129423 is a deficient number, since it is larger than the sum of its proper divisors (1018497).

7129423 is a wasteful number, since it uses less digits than its factorization.

7129423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018496.

The product of its digits is 3024, while the sum is 28.

The square root of 7129423 is about 2670.0979382787. The cubic root of 7129423 is about 192.4648656854.

It can be divided in two parts, 71294 and 23, that added together give a palindrome (71317).

The spelling of 7129423 in words is "seven million, one hundred twenty-nine thousand, four hundred twenty-three".