243899240 has 32 divisors (see below), whose sum is σ = 590987880. Its totient is φ = 90054912.

The previous prime is 243899239. The next prime is 243899263. The reversal of 243899240 is 42998342.

243899240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 153611236 + 90288004 = 12394^2 + 9502^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233999 + ... + 235038.

Almost surely, 2^243899240 is an apocalyptic number.

243899240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243899240 is an abundant number, since it is smaller than the sum of its proper divisors (347088640).

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

243899240 is a wasteful number, since it uses less digits than its factorization.

243899240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469061 (or 469057 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 243899240 is about 15617.2737697717. The cubic root of 243899240 is about 624.7939502104.

The spelling of 243899240 in words is "two hundred forty-three million, eight hundred ninety-nine thousand, two hundred forty".