243990625 has 24 divisors (see below), whose sum is σ = 307480320. Its totient is φ = 193590000.

The previous prime is 243990619. The next prime is 243990653. The reversal of 243990625 is 526099342.

It is not a de Polignac number, because 243990625 - 2⁷ = 243990497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 509136 + ... + 509614.

It is an arithmetic number, because the mean of its divisors is an integer number (12811680).

Almost surely, 2^243990625 is an apocalyptic number.

243990625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243990625 is a deficient number, since it is larger than the sum of its proper divisors (63489695).

243990625 is an frugal number, since it uses more digits than its factorization.

243990625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 243990625 is about 15620.1992624934. The cubic root of 243990625 is about 624.8719737766.

The spelling of 243990625 in words is "two hundred forty-three million, nine hundred ninety thousand, six hundred twenty-five".