1278487 has 4 divisors (see below), whose sum is σ = 1461136. Its totient is φ = 1095840.

The previous prime is 1278481. The next prime is 1278493. The reversal of 1278487 is 7848721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7848721 = 1289 ⋅6089.

It is an interprime number because it is at equal distance from previous prime (1278481) and next prime (1278493).

It is a cyclic number.

It is not a de Polignac number, because 1278487 - 2³ = 1278479 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 (1278481) 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, 91314 + ... + 91327.

It is an arithmetic number, because the mean of its divisors is an integer number (365284).

2^1278487 is an apocalyptic number.

1278487 is a deficient number, since it is larger than the sum of its proper divisors (182649).

1278487 is an equidigital number, since it uses as much as digits as its factorization.

1278487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182648.

The product of its digits is 25088, while the sum is 37.

The square root of 1278487 is about 1130.7019943380. The cubic root of 1278487 is about 108.5339074442.

The spelling of 1278487 in words is "one million, two hundred seventy-eight thousand, four hundred eighty-seven".