209077990 has 16 divisors (see below), whose sum is σ = 410553360. Its totient is φ = 76028320.

The previous prime is 209077969. The next prime is 209078011. The reversal of 209077990 is 99770902.

209077990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (209077969) and next prime (209078011).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950245 + ... + 950464.

It is an arithmetic number, because the mean of its divisors is an integer number (25659585).

Almost surely, 2^209077990 is an apocalyptic number.

209077990 is a deficient number, since it is larger than the sum of its proper divisors (201475370).

209077990 is a wasteful number, since it uses less digits than its factorization.

209077990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900727.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 209077990 is about 14459.5293837663. The cubic root of 209077990 is about 593.5210213645.

The spelling of 209077990 in words is "two hundred nine million, seventy-seven thousand, nine hundred ninety".