1978375 has 48 divisors (see below), whose sum is σ = 3201120. Its totient is φ = 1209600.

The previous prime is 1978363. The next prime is 1978393. The reversal of 1978375 is 5738791.

It is not a de Polignac number, because 1978375 - 2⁵ = 1978343 is a prime.

1978375 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104116 + ... + 104134.

It is an arithmetic number, because the mean of its divisors is an integer number (66690).

2^1978375 is an apocalyptic number.

1978375 is a deficient number, since it is larger than the sum of its proper divisors (1222745).

1978375 is a wasteful number, since it uses less digits than its factorization.

1978375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 48 counting only the distinct ones).

The product of its digits is 52920, while the sum is 40.

The square root of 1978375 is about 1406.5471908187. The cubic root of 1978375 is about 125.5363619022.

The spelling of 1978375 in words is "one million, nine hundred seventy-eight thousand, three hundred seventy-five".