1278125 has 12 divisors (see below), whose sum is σ = 1601460. Its totient is φ = 1020000.

The previous prime is 1278113. The next prime is 1278131. The reversal of 1278125 is 5218721.

It can be written as a sum of positive squares in 6 ways, for example, as 779689 + 498436 = 883^2 + 706^2 .

It is not a de Polignac number, because 1278125 - 2¹⁸ = 1015981 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1278094 and 1278103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2921 + ... + 3329.

It is an arithmetic number, because the mean of its divisors is an integer number (133455).

2^1278125 is an apocalyptic number.

It is an amenable number.

1278125 is a deficient number, since it is larger than the sum of its proper divisors (323335).

1278125 is an frugal number, since it uses more digits than its factorization.

1278125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 414 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1278125 is about 1130.5419054595. The cubic root of 1278125 is about 108.5236627869.

The spelling of 1278125 in words is "one million, two hundred seventy-eight thousand, one hundred twenty-five".