1378275 has 48 divisors (see below), whose sum is σ = 2571264. Its totient is φ = 647680.

The previous prime is 1378271. The next prime is 1378277. The reversal of 1378275 is 5728731.

It is a Cunningham number, because it is equal to 1174²-1.

It is not a de Polignac number, because 1378275 - 2² = 1378271 is a prime.

1378275 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1378271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29302 + ... + 29348.

It is an arithmetic number, because the mean of its divisors is an integer number (53568).

2^1378275 is an apocalyptic number.

1378275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1378275 is a deficient number, since it is larger than the sum of its proper divisors (1192989).

1378275 is a wasteful number, since it uses less digits than its factorization.

1378275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 95 counting only the distinct ones).

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

The square root of 1378275 is about 1173.9995741055. Note that the first 3 decimals coincide. The cubic root of 1378275 is about 111.2872197982.

It can be divided in two parts, 1378 and 275, that added together give a triangular number (1653 = T₅₇).

The spelling of 1378275 in words is "one million, three hundred seventy-eight thousand, two hundred seventy-five".