1287415478 has 16 divisors (see below), whose sum is σ = 2018704896. Its totient is φ = 614614440.

The previous prime is 1287415477. The next prime is 1287415483. The reversal of 1287415478 is 8745147821.

It is a super-2 number, since 2×1287415478² = 3314877225987936968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287415477) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1043 + ... + 50753.

It is an arithmetic number, because the mean of its divisors is an integer number (126169056).

Almost surely, 2^1287415478 is an apocalyptic number.

1287415478 is a deficient number, since it is larger than the sum of its proper divisors (731289418).

1287415478 is a wasteful number, since it uses less digits than its factorization.

1287415478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50299.

The product of its digits is 501760, while the sum is 47.

The square root of 1287415478 is about 35880.5724313311. The cubic root of 1287415478 is about 1087.8597505880.

The spelling of 1287415478 in words is "one billion, two hundred eighty-seven million, four hundred fifteen thousand, four hundred seventy-eight".