438640444 has 12 divisors (see below), whose sum is σ = 837404568. Its totient is φ = 199382000.

The previous prime is 438640387. The next prime is 438640471. The reversal of 438640444 is 444046834.

It is a super-2 number, since 2×438640444² = 384810878225034272, which contains 22 as substring.

It is a congruent number.

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, 4984507 + ... + 4984594.

It is an arithmetic number, because the mean of its divisors is an integer number (69783714).

Almost surely, 2^438640444 is an apocalyptic number.

438640444 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

438640444 is a deficient number, since it is larger than the sum of its proper divisors (398764124).

438640444 is a wasteful number, since it uses less digits than its factorization.

438640444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9969116 (or 9969114 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 37.

The square root of 438640444 is about 20943.7447463437. The cubic root of 438640444 is about 759.8063010522.

The spelling of 438640444 in words is "four hundred thirty-eight million, six hundred forty thousand, four hundred forty-four".