209983725 has 96 divisors (see below), whose sum is σ = 464256000. Its totient is φ = 90901440.

The previous prime is 209983717. The next prime is 209983729. The reversal of 209983725 is 527389902.

It is not a de Polignac number, because 209983725 - 2³ = 209983717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209983729) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 88606 + ... + 90944.

It is an arithmetic number, because the mean of its divisors is an integer number (4836000).

Almost surely, 2^209983725 is an apocalyptic number.

209983725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

209983725 is an abundant number, since it is smaller than the sum of its proper divisors (254272275).

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

209983725 is a wasteful number, since it uses less digits than its factorization.

209983725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2373 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 209983725 is about 14490.8151944602. The cubic root of 209983725 is about 594.3768397479.

The spelling of 209983725 in words is "two hundred nine million, nine hundred eighty-three thousand, seven hundred twenty-five".