1820000001 has 8 divisors (see below), whose sum is σ = 2430419904. Its totient is φ = 1211456720.

The previous prime is 1819999999. The next prime is 1820000003. The reversal of 1820000001 is 1000000281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1819999999) and next prime (1820000003).

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 1820000001 - 2¹ = 1819999999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1820000003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466890 + ... + 470771.

It is an arithmetic number, because the mean of its divisors is an integer number (303802488).

Almost surely, 2^1820000001 is an apocalyptic number.

It is an amenable number.

1820000001 is a deficient number, since it is larger than the sum of its proper divisors (610419903).

1820000001 is an equidigital number, since it uses as much as digits as its factorization.

1820000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938311.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1820000001 is about 42661.4580271233. The cubic root of 1820000001 is about 1220.9291499704.

Adding to 1820000001 its reverse (1000000281), we get a palindrome (2820000282).

The spelling of 1820000001 in words is "one billion, eight hundred twenty million, one", and thus it is an aban number.