438766640 has 40 divisors (see below), whose sum is σ = 1098606768. Its totient is φ = 162005760.

The previous prime is 438766637. The next prime is 438766673. The reversal of 438766640 is 46667834.

It is a happy number.

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 = 438766591 and 438766600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209906 + ... + 211985.

Almost surely, 2^438766640 is an apocalyptic number.

438766640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

438766640 is an abundant number, since it is smaller than the sum of its proper divisors (659840128).

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

438766640 is a wasteful number, since it uses less digits than its factorization.

438766640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421917 (or 421911 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The square root of 438766640 is about 20946.7572669375. The cubic root of 438766640 is about 759.8791589958.

The spelling of 438766640 in words is "four hundred thirty-eight million, seven hundred sixty-six thousand, six hundred forty".