406626444240 has 80 divisors (see below), whose sum is σ = 1260699518400. Its totient is φ = 108420166656.

The previous prime is 406626444221. The next prime is 406626444253. The reversal of 406626444240 is 42444626604.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 406626444192 and 406626444201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1897251 + ... + 2100669.

It is an arithmetic number, because the mean of its divisors is an integer number (15758743980).

Almost surely, 2^406626444240 is an apocalyptic number.

406626444240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

406626444240 is an abundant number, since it is smaller than the sum of its proper divisors (854073074160).

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

406626444240 is a wasteful number, since it uses less digits than its factorization.

406626444240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211764 (or 211758 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 406626444240 in words is "four hundred six billion, six hundred twenty-six million, four hundred forty-four thousand, two hundred forty".