1273840478405 has 8 divisors (see below), whose sum is σ = 1667572989984. Its totient is φ = 926429438800.

The previous prime is 1273840478381. The next prime is 1273840478411. The reversal of 1273840478405 is 5048740483721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1273840478405 - 2²⁸ = 1273572042949 is a prime.

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, 11580367931 + ... + 11580368040.

It is an arithmetic number, because the mean of its divisors is an integer number (208446623748).

Almost surely, 2^{1273840478405} is an apocalyptic number.

It is an amenable number.

1273840478405 is a deficient number, since it is larger than the sum of its proper divisors (393732511579).

1273840478405 is a wasteful number, since it uses less digits than its factorization.

1273840478405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23160735987.

The product of its (nonzero) digits is 6021120, while the sum is 53.

The spelling of 1273840478405 in words is "one trillion, two hundred seventy-three billion, eight hundred forty million, four hundred seventy-eight thousand, four hundred five".