1200002001 has 32 divisors (see below), whose sum is σ = 1850688000. Its totient is φ = 683546880.

The previous prime is 1200001987. The next prime is 1200002017. The reversal of 1200002001 is 1002000021.

It is a happy number.

It is not a de Polignac number, because 1200002001 - 2¹⁴ = 1199985617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200002081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 705450 + ... + 707148.

It is an arithmetic number, because the mean of its divisors is an integer number (57834000).

Almost surely, 2^1200002001 is an apocalyptic number.

1200002001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200002001 is a deficient number, since it is larger than the sum of its proper divisors (650685999).

1200002001 is a wasteful number, since it uses less digits than its factorization.

1200002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1200002001 is about 34641.0450333127. The cubic root of 1200002001 is about 1062.6591598433.

Adding to 1200002001 its reverse (1002000021), we get a palindrome (2202002022).

The spelling of 1200002001 in words is "one billion, two hundred million, two thousand, one".