1287240415 has 8 divisors (see below), whose sum is σ = 1573833888. Its totient is φ = 1010362080.

The previous prime is 1287240413. The next prime is 1287240433. The reversal of 1287240415 is 5140427821.

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

It is not a de Polignac number, because 1287240415 - 2¹ = 1287240413 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 (1287240413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2428491 + ... + 2429020.

It is an arithmetic number, because the mean of its divisors is an integer number (196729236).

Almost surely, 2^1287240415 is an apocalyptic number.

1287240415 is a deficient number, since it is larger than the sum of its proper divisors (286593473).

1287240415 is an equidigital number, since it uses as much as digits as its factorization.

1287240415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857569.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 1287240415 is about 35878.1328248837. The cubic root of 1287240415 is about 1087.8104392280.

The spelling of 1287240415 in words is "one billion, two hundred eighty-seven million, two hundred forty thousand, four hundred fifteen".