1278207 has 16 divisors (see below), whose sum is σ = 2164480. Its totient is φ = 730296.

The previous prime is 1278203. The next prime is 1278209. The reversal of 1278207 is 7028721.

It is not a de Polignac number, because 1278207 - 2² = 1278203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278203) 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, 3193 + ... + 3570.

It is an arithmetic number, because the mean of its divisors is an integer number (135280).

2^1278207 is an apocalyptic number.

1278207 is a deficient number, since it is larger than the sum of its proper divisors (886273).

1278207 is an equidigital number, since it uses as much as digits as its factorization.

1278207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6779 (or 6773 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1278207 is about 1130.5781706720. The cubic root of 1278207 is about 108.5259835693.

It can be divided in two parts, 1278 and 207, that added together give a triangular number (1485 = T₅₄).

The spelling of 1278207 in words is "one million, two hundred seventy-eight thousand, two hundred seven".