1272403212400 has 60 divisors (see below), whose sum is σ = 3189859554672. Its totient is φ = 486832529920.

The previous prime is 1272403212359. The next prime is 1272403212401. The reversal of 1272403212400 is 42123042721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272403212401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69143149 + ... + 69161548.

Almost surely, 2^{1272403212400} is an apocalyptic number.

1272403212400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272403212400 is an abundant number, since it is smaller than the sum of its proper divisors (1917456342272).

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

1272403212400 is a wasteful number, since it uses less digits than its factorization.

1272403212400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138304738 (or 138304727 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

It can be divided in two parts, 127240321 and 2400, that added together give a palindrome (127242721).

The spelling of 1272403212400 in words is "one trillion, two hundred seventy-two billion, four hundred three million, two hundred twelve thousand, four hundred".