406440266640 has 40 divisors (see below), whose sum is σ = 1259964827328. Its totient is φ = 108384071040.

The previous prime is 406440266611. The next prime is 406440266653. The reversal of 406440266640 is 46662044604.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 406440266592 and 406440266601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846750316 + ... + 846750795.

Almost surely, 2^406440266640 is an apocalyptic number.

406440266640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

406440266640 is an abundant number, since it is smaller than the sum of its proper divisors (853524560688).

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

406440266640 is a wasteful number, since it uses less digits than its factorization.

406440266640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693501127 (or 1693501121 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 406440266640 in words is "four hundred six billion, four hundred forty million, two hundred sixty-six thousand, six hundred forty".