209072454 has 12 divisors (see below), whose sum is σ = 418215756. Its totient is φ = 69679012.

The previous prime is 209072431. The next prime is 209072471. The reversal of 209072454 is 454270902.

It is a super-2 number, since 2×209072454² = 87422582043164232, which contains 22 as substring.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 32467 + ... + 38369.

It is an arithmetic number, because the mean of its divisors is an integer number (34851313).

Almost surely, 2^209072454 is an apocalyptic number.

209072454 is an abundant number, since it is smaller than the sum of its proper divisors (209143302).

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

209072454 is an frugal number, since it uses more digits than its factorization.

209072454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11811 (or 5908 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 209072454 is about 14459.3379516491. The cubic root of 209072454 is about 593.5157828705.

The spelling of 209072454 in words is "two hundred nine million, seventy-two thousand, four hundred fifty-four".