209263138 has 8 divisors (see below), whose sum is σ = 358736832. Its totient is φ = 89684196.

The previous prime is 209263111. The next prime is 209263151. The reversal of 209263138 is 831362902.

It is a happy number.

209263138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7473670 + ... + 7473697.

It is an arithmetic number, because the mean of its divisors is an integer number (44842104).

Almost surely, 2^209263138 is an apocalyptic number.

209263138 is a deficient number, since it is larger than the sum of its proper divisors (149473694).

209263138 is a wasteful number, since it uses less digits than its factorization.

209263138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14947376.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 209263138 is about 14465.9302500738. The cubic root of 209263138 is about 593.6961662291.

The spelling of 209263138 in words is "two hundred nine million, two hundred sixty-three thousand, one hundred thirty-eight".