243138770 has 32 divisors (see below), whose sum is σ = 511809408. Its totient is φ = 81422208.

The previous prime is 243138767. The next prime is 243138799. The reversal of 243138770 is 77831342.

It is a super-2 number, since 2×243138770² = 118232922954225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243138770.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 37379 + ... + 43398.

It is an arithmetic number, because the mean of its divisors is an integer number (15994044).

Almost surely, 2^243138770 is an apocalyptic number.

243138770 is an abundant number, since it is smaller than the sum of its proper divisors (268670638).

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

243138770 is a wasteful number, since it uses less digits than its factorization.

243138770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80834.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 243138770 is about 15592.9076826614. The cubic root of 243138770 is about 624.1439116491.

The spelling of 243138770 in words is "two hundred forty-three million, one hundred thirty-eight thousand, seven hundred seventy".