243890 has 16 divisors (see below), whose sum is σ = 454680. Its totient is φ = 94192.

The previous prime is 243889. The next prime is 243911. The reversal of 243890 is 98342.

It can be written as a sum of positive squares in 4 ways, for example, as 113569 + 130321 = 337^2 + 361^2 .

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, 8396 + ... + 8424.

2²⁴³⁸⁹⁰ is an apocalyptic number.

243890 is a deficient number, since it is larger than the sum of its proper divisors (210790).

243890 is an frugal number, since it uses more digits than its factorization.

243890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 243890 is about 493.8522046119. The cubic root of 243890 is about 62.4786060109.

The spelling of 243890 in words is "two hundred forty-three thousand, eight hundred ninety".