1287172854 has 24 divisors (see below), whose sum is σ = 3042409032. Its totient is φ = 390052320.

The previous prime is 1287172837. The next prime is 1287172877. The reversal of 1287172854 is 4582717821.

It is a congruent number.

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, 3250239 + ... + 3250634.

It is an arithmetic number, because the mean of its divisors is an integer number (126767043).

Almost surely, 2^1287172854 is an apocalyptic number.

1287172854 is an abundant number, since it is smaller than the sum of its proper divisors (1755236178).

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

1287172854 is a wasteful number, since it uses less digits than its factorization.

1287172854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6500892 (or 6500889 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1287172854 is about 35877.1912780251. The cubic root of 1287172854 is about 1087.7914075988.

The spelling of 1287172854 in words is "one billion, two hundred eighty-seven million, one hundred seventy-two thousand, eight hundred fifty-four".