406240420 has 12 divisors (see below), whose sum is σ = 853104924. Its totient is φ = 162496160.

The previous prime is 406240369. The next prime is 406240447. The reversal of 406240420 is 24042604.

It can be written as a sum of positive squares in 2 ways, for example, as 133263936 + 272976484 = 11544^2 + 16522^2 .

It is a junction number, because it is equal to n+sod(n) for n = 406240391 and 406240400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10155991 + ... + 10156030.

It is an arithmetic number, because the mean of its divisors is an integer number (71092077).

Almost surely, 2^406240420 is an apocalyptic number.

It is an amenable number.

406240420 is an abundant number, since it is smaller than the sum of its proper divisors (446864504).

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

406240420 is a wasteful number, since it uses less digits than its factorization.

406240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20312030 (or 20312028 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 406240420 is about 20155.4067187938. The cubic root of 406240420 is about 740.6181953715.

The spelling of 406240420 in words is "four hundred six million, two hundred forty thousand, four hundred twenty".