209792990 has 16 divisors (see below), whose sum is σ = 411957360. Its totient is φ = 76288320.

The previous prime is 209792939. The next prime is 209792993. The reversal of 209792990 is 99297902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209792993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953495 + ... + 953714.

It is an arithmetic number, because the mean of its divisors is an integer number (25747335).

Almost surely, 2^209792990 is an apocalyptic number.

209792990 is a deficient number, since it is larger than the sum of its proper divisors (202164370).

209792990 is a wasteful number, since it uses less digits than its factorization.

209792990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907227.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 209792990 is about 14484.2324615424. The cubic root of 209792990 is about 594.1968213373.

The spelling of 209792990 in words is "two hundred nine million, seven hundred ninety-two thousand, nine hundred ninety".