209138498 has 8 divisors (see below), whose sum is σ = 321003408. Its totient is φ = 102137364.

The previous prime is 209138497. The next prime is 209138521. The reversal of 209138498 is 894831902.

It is a happy number.

209138498 is digitally balanced in base 2 and base 3, because in such bases 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 a super-2 number, since 2×209138498² = 87477822691392008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209138497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215836 + ... + 1216007.

It is an arithmetic number, because the mean of its divisors is an integer number (40125426).

Almost surely, 2^209138498 is an apocalyptic number.

209138498 is a deficient number, since it is larger than the sum of its proper divisors (111864910).

209138498 is a wasteful number, since it uses less digits than its factorization.

209138498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431888.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 209138498 is about 14461.6215549986. The cubic root of 209138498 is about 593.5782716217.

The spelling of 209138498 in words is "two hundred nine million, one hundred thirty-eight thousand, four hundred ninety-eight".