209954842 has 4 divisors (see below), whose sum is σ = 314932266. Its totient is φ = 104977420.

The previous prime is 209954839. The next prime is 209954887. The reversal of 209954842 is 248459902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248459902 = 2 ⋅124229951.

It can be written as a sum of positive squares in only one way, i.e., 123632161 + 86322681 = 11119^2 + 9291^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52488709 + ... + 52488712.

Almost surely, 2^209954842 is an apocalyptic number.

209954842 is a deficient number, since it is larger than the sum of its proper divisors (104977424).

209954842 is a wasteful number, since it uses less digits than its factorization.

209954842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104977423.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 209954842 is about 14489.8185633913. The cubic root of 209954842 is about 594.3495865668.

The spelling of 209954842 in words is "two hundred nine million, nine hundred fifty-four thousand, eight hundred forty-two".