1273931366400 has 2592 divisors, whose sum is σ = 6225497792640. Its totient is φ = 249141657600.

The previous prime is 1273931366359. The next prime is 1273931366419. The reversal of 1273931366400 is 46631393721.

1273931366400 is a `hidden beast` number, since 1 + 27 + 3 + 93 + 136 + 6 + 400 = 666.

It is a super-2 number, since 2×1273931366400² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 74937139192 + ... + 74937139208.

It is an arithmetic number, because the mean of its divisors is an integer number (2401812420).

Almost surely, 2^{1273931366400} is an apocalyptic number.

1273931366400 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 1273931366400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3112748896320).

1273931366400 is an abundant number, since it is smaller than the sum of its proper divisors (4951566426240).

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

1273931366400 is an equidigital number, since it uses as much as digits as its factorization.

1273931366400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The spelling of 1273931366400 in words is "one trillion, two hundred seventy-three billion, nine hundred thirty-one million, three hundred sixty-six thousand, four hundred".