1278164 has 6 divisors (see below), whose sum is σ = 2236794. Its totient is φ = 639080.

The previous prime is 1278163. The next prime is 1278181. The reversal of 1278164 is 4618721.

It can be written as a sum of positive squares in only one way, i.e., 1020100 + 258064 = 1010^2 + 508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159767 + ... + 159774.

It is an arithmetic number, because the mean of its divisors is an integer number (372799).

2^1278164 is an apocalyptic number.

It is an amenable number.

1278164 is a deficient number, since it is larger than the sum of its proper divisors (958630).

1278164 is a wasteful number, since it uses less digits than its factorization.

1278164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319545 (or 319543 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 1278164 is about 1130.5591536934. The cubic root of 1278164 is about 108.5247665861.

The spelling of 1278164 in words is "one million, two hundred seventy-eight thousand, one hundred sixty-four".