243878420 has 24 divisors (see below), whose sum is σ = 512763048. Its totient is φ = 97433600.

The previous prime is 243878417. The next prime is 243878443. The reversal of 243878420 is 24878342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 643204 + 243235216 = 802^2 + 15596^2 .

It is a congruent number.

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, 10700 + ... + 24540.

It is an arithmetic number, because the mean of its divisors is an integer number (21365127).

Almost surely, 2^243878420 is an apocalyptic number.

243878420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243878420 is an abundant number, since it is smaller than the sum of its proper divisors (268884628).

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

243878420 is a wasteful number, since it uses less digits than its factorization.

243878420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14731 (or 14729 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 243878420 is about 15616.6071859415. The cubic root of 243878420 is about 624.7761715842.

The spelling of 243878420 in words is "two hundred forty-three million, eight hundred seventy-eight thousand, four hundred twenty".