1278388 has 12 divisors (see below), whose sum is σ = 2245572. Its totient is φ = 636800.

The previous prime is 1278379. The next prime is 1278391. The reversal of 1278388 is 8838721.

It can be written as a sum of positive squares in 2 ways, for example, as 1036324 + 242064 = 1018^2 + 492^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1206 + ... + 2002.

It is an arithmetic number, because the mean of its divisors is an integer number (187131).

2^1278388 is an apocalyptic number.

It is an amenable number.

1278388 is a deficient number, since it is larger than the sum of its proper divisors (967184).

1278388 is a wasteful number, since it uses less digits than its factorization.

1278388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1200 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 1278388 is about 1130.6582153772. The cubic root of 1278388 is about 108.5311059207.

It can be divided in two parts, 127 and 8388, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 1278388 in words is "one million, two hundred seventy-eight thousand, three hundred eighty-eight".