1978675 has 6 divisors (see below), whose sum is σ = 2453588. Its totient is φ = 1582920.

The previous prime is 1978673. The next prime is 1978687. The reversal of 1978675 is 5768791.

It is not a de Polignac number, because 1978675 - 2¹ = 1978673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978673) 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 5 ways as a sum of consecutive naturals, for example, 39549 + ... + 39598.

2^1978675 is an apocalyptic number.

1978675 is a deficient number, since it is larger than the sum of its proper divisors (474913).

1978675 is an equidigital number, since it uses as much as digits as its factorization.

1978675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79157 (or 79152 counting only the distinct ones).

The product of its digits is 105840, while the sum is 43.

The square root of 1978675 is about 1406.6538309051. The cubic root of 1978675 is about 125.5427070095.

The spelling of 1978675 in words is "one million, nine hundred seventy-eight thousand, six hundred seventy-five".