1287457215 has 32 divisors (see below), whose sum is σ = 2251259136. Its totient is φ = 623093760.

The previous prime is 1287457211. The next prime is 1287457219. The reversal of 1287457215 is 5127547821.

It is an interprime number because it is at equal distance from previous prime (1287457211) and next prime (1287457219).

It is not a de Polignac number, because 1287457215 - 2² = 1287457211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287457211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88444 + ... + 101966.

It is an arithmetic number, because the mean of its divisors is an integer number (70351848).

Almost surely, 2^1287457215 is an apocalyptic number.

1287457215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287457215 is a deficient number, since it is larger than the sum of its proper divisors (963801921).

1287457215 is a wasteful number, since it uses less digits than its factorization.

1287457215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14119.

The product of its digits is 156800, while the sum is 42.

The square root of 1287457215 is about 35881.1540366249. The cubic root of 1287457215 is about 1087.8715063143.

The spelling of 1287457215 in words is "one billion, two hundred eighty-seven million, four hundred fifty-seven thousand, two hundred fifteen".