424128973 has 4 divisors (see below), whose sum is σ = 438754140. Its totient is φ = 409503808.

The previous prime is 424128941. The next prime is 424128977. The reversal of 424128973 is 379821424.

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

It can be written as a sum of positive squares in 2 ways, for example, as 191047684 + 233081289 = 13822^2 + 15267^2 .

It is a cyclic number.

It is not a de Polignac number, because 424128973 - 2⁵ = 424128941 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424128977) 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, 7312540 + ... + 7312597.

It is an arithmetic number, because the mean of its divisors is an integer number (109688535).

Almost surely, 2^424128973 is an apocalyptic number.

It is an amenable number.

424128973 is a deficient number, since it is larger than the sum of its proper divisors (14625167).

424128973 is a wasteful number, since it uses less digits than its factorization.

424128973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14625166.

The product of its digits is 96768, while the sum is 40.

The square root of 424128973 is about 20594.3917851438. The cubic root of 424128973 is about 751.3333159904. Note that the first 4 decimals are identical.

The spelling of 424128973 in words is "four hundred twenty-four million, one hundred twenty-eight thousand, nine hundred seventy-three".