723423421 has 4 divisors (see below), whose sum is σ = 826769632. Its totient is φ = 620077212.

The previous prime is 723423419. The next prime is 723423521. The reversal of 723423421 is 124324327.

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 723423421 - 2¹ = 723423419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 723423421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723423521) 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, 51673095 + ... + 51673108.

It is an arithmetic number, because the mean of its divisors is an integer number (206692408).

Almost surely, 2^723423421 is an apocalyptic number.

It is an amenable number.

723423421 is a deficient number, since it is larger than the sum of its proper divisors (103346211).

723423421 is a wasteful number, since it uses less digits than its factorization.

723423421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103346210.

The product of its digits is 8064, while the sum is 28.

The square root of 723423421 is about 26896.5317652667. The cubic root of 723423421 is about 897.6992348454.

Adding to 723423421 its reverse (124324327), we get a palindrome (847747748).

The spelling of 723423421 in words is "seven hundred twenty-three million, four hundred twenty-three thousand, four hundred twenty-one".