209493972 has 48 divisors (see below), whose sum is σ = 545227200. Its totient is φ = 69562080.

The previous prime is 209493953. The next prime is 209493983. The reversal of 209493972 is 279394902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25447 + ... + 32657.

It is an arithmetic number, because the mean of its divisors is an integer number (11358900).

Almost surely, 2^209493972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209493972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272613600).

209493972 is an abundant number, since it is smaller than the sum of its proper divisors (335733228).

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

209493972 is a wasteful number, since it uses less digits than its factorization.

209493972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493 (or 7485 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 209493972 is about 14473.9065908275. The cubic root of 209493972 is about 593.9143841506.

The spelling of 209493972 in words is "two hundred nine million, four hundred ninety-three thousand, nine hundred seventy-two".