1273897021638 has 16 divisors (see below), whose sum is σ = 2548064307456. Its totient is φ = 424587296520.

The previous prime is 1273897021601. The next prime is 1273897021643. The reversal of 1273897021638 is 8361207983721.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11199706 + ... + 11312877.

It is an arithmetic number, because the mean of its divisors is an integer number (159254019216).

Almost surely, 2^{1273897021638} is an apocalyptic number.

1273897021638 is an abundant number, since it is smaller than the sum of its proper divisors (1274167285818).

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

1273897021638 is a wasteful number, since it uses less digits than its factorization.

1273897021638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22522019.

The product of its (nonzero) digits is 6096384, while the sum is 57.

The spelling of 1273897021638 in words is "one trillion, two hundred seventy-three billion, eight hundred ninety-seven million, twenty-one thousand, six hundred thirty-eight".