243820825 has 12 divisors (see below), whose sum is σ = 318250960. Its totient is φ = 184790160.

The previous prime is 243820813. The next prime is 243820831. The reversal of 243820825 is 528028342.

It is a happy number.

It is not a de Polignac number, because 243820825 - 2¹³ = 243812633 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 256179 + ... + 257128.

Almost surely, 2^243820825 is an apocalyptic number.

243820825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243820825 is a deficient number, since it is larger than the sum of its proper divisors (74430135).

243820825 is a wasteful number, since it uses less digits than its factorization.

243820825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513336 (or 513331 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 243820825 is about 15614.7630465531. The cubic root of 243820825 is about 624.7269847576.

The spelling of 243820825 in words is "two hundred forty-three million, eight hundred twenty thousand, eight hundred twenty-five".