209400001 has 8 divisors (see below), whose sum is σ = 212193000. Its totient is φ = 206616960.

The previous prime is 209399951. The next prime is 209400019. The reversal of 209400001 is 100004902.

It can be written as a sum of positive squares in 4 ways, for example, as 4223025 + 205176976 = 2055^2 + 14324^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 209400001 - 2¹⁵ = 209367233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209400031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45975 + ... + 50323.

It is an arithmetic number, because the mean of its divisors is an integer number (26524125).

Almost surely, 2^209400001 is an apocalyptic number.

It is an amenable number.

209400001 is a deficient number, since it is larger than the sum of its proper divisors (2792999).

209400001 is an equidigital number, since it uses as much as digits as its factorization.

209400001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4979.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 209400001 is about 14470.6600056805. The cubic root of 209400001 is about 593.8255684279.

Adding to 209400001 its reverse (100004902), we get a palindrome (309404903).

The spelling of 209400001 in words is "two hundred nine million, four hundred thousand, one".