1273123200 has 384 divisors, whose sum is σ = 4610196000. Its totient is φ = 307363840.

The previous prime is 1273123193. The next prime is 1273123207. The reversal of 1273123200 is 23213721.

It is an interprime number because it is at equal distance from previous prime (1273123193) and next prime (1273123207).

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273123207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4732666 + ... + 4732934.

Almost surely, 2^1273123200 is an apocalyptic number.

1273123200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1273123200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2305098000).

1273123200 is an abundant number, since it is smaller than the sum of its proper divisors (3337072800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1273123200 is a wasteful number, since it uses less digits than its factorization.

1273123200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 1273123200 is about 35680.8520077646. The cubic root of 1273123200 is about 1083.8191262418.

Adding to 1273123200 its reverse (23213721), we get a palindrome (1296336921).

The spelling of 1273123200 in words is "one billion, two hundred seventy-three million, one hundred twenty-three thousand, two hundred".