209894401 has 4 divisors (see below), whose sum is σ = 210499632. Its totient is φ = 209289172.

The previous prime is 209894383. The next prime is 209894411. The reversal of 209894401 is 104498902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209894401 - 2¹⁵ = 209861633 is a prime.

It is a super-2 number, since 2×209894401² = 88111319142297602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209894411) 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, 302095 + ... + 302788.

It is an arithmetic number, because the mean of its divisors is an integer number (52624908).

Almost surely, 2^209894401 is an apocalyptic number.

It is an amenable number.

209894401 is a deficient number, since it is larger than the sum of its proper divisors (605231).

209894401 is an equidigital number, since it uses as much as digits as its factorization.

209894401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605230.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 209894401 is about 14487.7327763871. The cubic root of 209894401 is about 594.2925480616.

The spelling of 209894401 in words is "two hundred nine million, eight hundred ninety-four thousand, four hundred one".