1277887500389 has 16 divisors (see below), whose sum is σ = 1334515253760. Its totient is φ = 1222834641600.

The previous prime is 1277887500377. The next prime is 1277887500431. The reversal of 1277887500389 is 9830057887721.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1277887500389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277887520389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1422869 + ... + 2140170.

It is an arithmetic number, because the mean of its divisors is an integer number (83407203360).

Almost surely, 2^{1277887500389} is an apocalyptic number.

It is an amenable number.

1277887500389 is a deficient number, since it is larger than the sum of its proper divisors (56627753371).

1277887500389 is a wasteful number, since it uses less digits than its factorization.

1277887500389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563260.

The product of its (nonzero) digits is 47416320, while the sum is 65.

The spelling of 1277887500389 in words is "one trillion, two hundred seventy-seven billion, eight hundred eighty-seven million, five hundred thousand, three hundred eighty-nine".