209943425 has 12 divisors (see below), whose sum is σ = 271649280. Its totient is φ = 160651920.

The previous prime is 209943413. The next prime is 209943431. The reversal of 209943425 is 524349902.

It is a happy number.

It is not a de Polignac number, because 209943425 - 2¹² = 209939329 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181985 + ... + 183134.

It is an arithmetic number, because the mean of its divisors is an integer number (22637440).

Almost surely, 2^209943425 is an apocalyptic number.

209943425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

209943425 is a deficient number, since it is larger than the sum of its proper divisors (61705855).

209943425 is a wasteful number, since it uses less digits than its factorization.

209943425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365152 (or 365147 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 209943425 is about 14489.4245917497. The cubic root of 209943425 is about 594.3388131196.

The spelling of 209943425 in words is "two hundred nine million, nine hundred forty-three thousand, four hundred twenty-five".