406721424 has 40 divisors (see below), whose sum is σ = 1053023872. Its totient is φ = 135273600.

The previous prime is 406721389. The next prime is 406721431. The reversal of 406721424 is 424127604.

It is a junction number, because it is equal to n+sod(n) for n = 406721391 and 406721400.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13074 + ... + 31374.

Almost surely, 2^406721424 is an apocalyptic number.

It is an amenable number.

406721424 is an abundant number, since it is smaller than the sum of its proper divisors (646302448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406721424 is a wasteful number, since it uses less digits than its factorization.

406721424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18775 (or 18769 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 406721424 is about 20167.3355701739. The cubic root of 406721424 is about 740.9103867182.

The spelling of 406721424 in words is "four hundred six million, seven hundred twenty-one thousand, four hundred twenty-four".