243139998 has 24 divisors (see below), whose sum is σ = 513225288. Its totient is φ = 76780368.

The previous prime is 243139957. The next prime is 243139999. The reversal of 243139998 is 899931342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243139999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53961 + ... + 58292.

It is an arithmetic number, because the mean of its divisors is an integer number (21384387).

Almost surely, 2^243139998 is an apocalyptic number.

243139998 is an abundant number, since it is smaller than the sum of its proper divisors (270085290).

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

243139998 is a wasteful number, since it uses less digits than its factorization.

243139998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112296 (or 112277 counting only the distinct ones).

The product of its digits is 419904, while the sum is 48.

The square root of 243139998 is about 15592.9470594881. The cubic root of 243139998 is about 624.1449624173.

The spelling of 243139998 in words is "two hundred forty-three million, one hundred thirty-nine thousand, nine hundred ninety-eight".