209730972 has 48 divisors (see below), whose sum is σ = 565270272. Its totient is φ = 59815680.

The previous prime is 209730923. The next prime is 209731003. The reversal of 209730972 is 279037902.

It is a self number, because there is not a number n which added to its sum of digits gives 209730972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44488 + ... + 48975.

It is an arithmetic number, because the mean of its divisors is an integer number (11776464).

Almost surely, 2^209730972 is an apocalyptic number.

209730972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

209730972 is an abundant number, since it is smaller than the sum of its proper divisors (355539300).

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

209730972 is a wasteful number, since it uses less digits than its factorization.

209730972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93498 (or 93496 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 209730972 is about 14482.0914235479. The cubic root of 209730972 is about 594.1382643596.

The spelling of 209730972 in words is "two hundred nine million, seven hundred thirty thousand, nine hundred seventy-two".