1278375 has 32 divisors (see below), whose sum is σ = 2436096. Its totient is φ = 583200.

The previous prime is 1278373. The next prime is 1278379. The reversal of 1278375 is 5738721.

It is not a de Polignac number, because 1278375 - 2¹ = 1278373 is a prime.

1278375 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2382 + ... + 2868.

It is an arithmetic number, because the mean of its divisors is an integer number (76128).

2^1278375 is an apocalyptic number.

1278375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1278375 is a deficient number, since it is larger than the sum of its proper divisors (1157721).

1278375 is an equidigital number, since it uses as much as digits as its factorization.

1278375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 502 counting only the distinct ones).

The product of its digits is 11760, while the sum is 33.

The square root of 1278375 is about 1130.6524664989. The cubic root of 1278375 is about 108.5307380331.

It can be divided in two parts, 1278 and 375, that added together give a triangular number (1653 = T₅₇).

The spelling of 1278375 in words is "one million, two hundred seventy-eight thousand, three hundred seventy-five".