1278465 has 16 divisors (see below), whose sum is σ = 2116800. Its totient is φ = 658112.

The previous prime is 1278463. The next prime is 1278467. The reversal of 1278465 is 5648721.

It is an interprime number because it is at equal distance from previous prime (1278463) and next prime (1278467).

It is a cyclic number.

It is not a de Polignac number, because 1278465 - 2¹ = 1278463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035 + ... + 1904.

It is an arithmetic number, because the mean of its divisors is an integer number (132300).

2^1278465 is an apocalyptic number.

1278465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278465 is a deficient number, since it is larger than the sum of its proper divisors (838335).

1278465 is a wasteful number, since it uses less digits than its factorization.

1278465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976.

The product of its digits is 13440, while the sum is 33.

The square root of 1278465 is about 1130.6922658266. The cubic root of 1278465 is about 108.5332848959.

The spelling of 1278465 in words is "one million, two hundred seventy-eight thousand, four hundred sixty-five".