1001200023 has 24 divisors (see below), whose sum is σ = 1532904048. Its totient is φ = 627524352.

The previous prime is 1001200019. The next prime is 1001200043. The reversal of 1001200023 is 3200021001.

It is a happy number.

It is not a de Polignac number, because 1001200023 - 2² = 1001200019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001199978 and 1001200014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001200043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164236 + ... + 170222.

It is an arithmetic number, because the mean of its divisors is an integer number (63871002).

Almost surely, 2^1001200023 is an apocalyptic number.

1001200023 is a deficient number, since it is larger than the sum of its proper divisors (531704025).

1001200023 is a wasteful number, since it uses less digits than its factorization.

1001200023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7103 (or 7100 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1001200023 is about 31641.7449424016. The cubic root of 1001200023 is about 1000.3998477671.

Adding to 1001200023 its reverse (3200021001), we get a palindrome (4201221024).

The spelling of 1001200023 in words is "one billion, one million, two hundred thousand, twenty-three".