1978275 has 24 divisors (see below), whose sum is σ = 3524080. Its totient is φ = 973440.

The previous prime is 1978267. The next prime is 1978289. The reversal of 1978275 is 5728791.

It is not a de Polignac number, because 1978275 - 2³ = 1978267 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

1978275 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40 + ... + 1989.

2^1978275 is an apocalyptic number.

1978275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1978275 is a deficient number, since it is larger than the sum of its proper divisors (1545805).

1978275 is a wasteful number, since it uses less digits than its factorization.

1978275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055 (or 2050 counting only the distinct ones).

The product of its digits is 35280, while the sum is 39.

The square root of 1978275 is about 1406.5116423265. The cubic root of 1978275 is about 125.5342467238.

The spelling of 1978275 in words is "one million, nine hundred seventy-eight thousand, two hundred seventy-five".