1215203423 has 4 divisors (see below), whose sum is σ = 1388803920. Its totient is φ = 1041602928.

The previous prime is 1215203383. The next prime is 1215203447. The reversal of 1215203423 is 3243025121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3243025121 = 7 ⋅463289303.

It is a cyclic number.

It is not a de Polignac number, because 1215203423 - 2²⁰ = 1214154847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215206423) 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, 86800238 + ... + 86800251.

It is an arithmetic number, because the mean of its divisors is an integer number (347200980).

Almost surely, 2^1215203423 is an apocalyptic number.

1215203423 is a deficient number, since it is larger than the sum of its proper divisors (173600497).

1215203423 is an equidigital number, since it uses as much as digits as its factorization.

1215203423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173600496.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1215203423 is about 34859.7679711154. The cubic root of 1215203423 is about 1067.1275397857.

Adding to 1215203423 its reverse (3243025121), we get a palindrome (4458228544).

The spelling of 1215203423 in words is "one billion, two hundred fifteen million, two hundred three thousand, four hundred twenty-three".