1200120023 has 4 divisors (see below), whose sum is σ = 1208754120. Its totient is φ = 1191485928.

The previous prime is 1200120017. The next prime is 1200120037. The reversal of 1200120023 is 3200210021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3200210021 = 32999 ⋅96979.

It is a cyclic number.

It is not a de Polignac number, because 1200120023 - 2⁴ = 1200120007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200119986 and 1200120013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200120223) 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, 4316840 + ... + 4317117.

It is an arithmetic number, because the mean of its divisors is an integer number (302188530).

Almost surely, 2^1200120023 is an apocalyptic number.

1200120023 is a deficient number, since it is larger than the sum of its proper divisors (8634097).

1200120023 is an equidigital number, since it uses as much as digits as its factorization.

1200120023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8634096.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1200120023 is about 34642.7484908458. The cubic root of 1200120023 is about 1062.6939967430.

Adding to 1200120023 its reverse (3200210021), we get a palindrome (4400330044).

The spelling of 1200120023 in words is "one billion, two hundred million, one hundred twenty thousand, twenty-three".