1245721376400 has 60 divisors (see below), whose sum is σ = 3990460812912. Its totient is φ = 332192366720.

The previous prime is 1245721376329. The next prime is 1245721376443. The reversal of 1245721376400 is 46731275421.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 519049374 + ... + 519051773.

Almost surely, 2^{1245721376400} is an apocalyptic number.

1245721376400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245721376400 is an abundant number, since it is smaller than the sum of its proper divisors (2744739436512).

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

1245721376400 is a wasteful number, since it uses less digits than its factorization.

1245721376400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038101168 (or 1038101157 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 1245721376400 in words is "one trillion, two hundred forty-five billion, seven hundred twenty-one million, three hundred seventy-six thousand, four hundred".