438969840 has 40 divisors (see below), whose sum is σ = 1360807248. Its totient is φ = 117058560.

The previous prime is 438969779. The next prime is 438969841. The reversal of 438969840 is 48969834.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438969841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 914281 + ... + 914760.

Almost surely, 2^438969840 is an apocalyptic number.

438969840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

438969840 is an abundant number, since it is smaller than the sum of its proper divisors (921837408).

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

438969840 is a wasteful number, since it uses less digits than its factorization.

438969840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829057 (or 1829051 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 438969840 is about 20951.6070982634. The cubic root of 438969840 is about 759.9964450434.

The spelling of 438969840 in words is "four hundred thirty-eight million, nine hundred sixty-nine thousand, eight hundred forty".