1287618 has 8 divisors (see below), whose sum is σ = 2575248. Its totient is φ = 429204.

The previous prime is 1287613. The next prime is 1287623. The reversal of 1287618 is 8167821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1287613) and next prime (1287623).

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

1287618 is an admirable number.

It is a super-2 number, since 2×1287618² = 3315920227848, which contains 22 as substring.

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (1287613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107296 + ... + 107307.

It is an arithmetic number, because the mean of its divisors is an integer number (321906).

2^1287618 is an apocalyptic number.

1287618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1287618 is a wasteful number, since it uses less digits than its factorization.

1287618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214608.

The product of its digits is 5376, while the sum is 33.

The square root of 1287618 is about 1134.7325676123. The cubic root of 1287618 is about 108.7916790962.

The spelling of 1287618 in words is "one million, two hundred eighty-seven thousand, six hundred eighteen".