1278915 has 32 divisors (see below), whose sum is σ = 2336256. Its totient is φ = 591360.

The previous prime is 1278911. The next prime is 1278983. The reversal of 1278915 is 5198721.

It is not a de Polignac number, because 1278915 - 2² = 1278911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1278911) 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, 3627 + ... + 3963.

It is an arithmetic number, because the mean of its divisors is an integer number (73008).

2^1278915 is an apocalyptic number.

1278915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1278915 is a deficient number, since it is larger than the sum of its proper divisors (1057341).

1278915 is a wasteful number, since it uses less digits than its factorization.

1278915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379.

The product of its digits is 5040, while the sum is 33.

The square root of 1278915 is about 1130.8912414552. The cubic root of 1278915 is about 108.5460174173.

The spelling of 1278915 in words is "one million, two hundred seventy-eight thousand, nine hundred fifteen".