1978674 has 8 divisors (see below), whose sum is σ = 3957360. Its totient is φ = 659556.

The previous prime is 1978673. The next prime is 1978687. The reversal of 1978674 is 4768791.

It is a sphenic number, since it is the product of 3 distinct primes.

1978674 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1978673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164884 + ... + 164895.

It is an arithmetic number, because the mean of its divisors is an integer number (494670).

2^1978674 is an apocalyptic number.

1978674 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978674 is a wasteful number, since it uses less digits than its factorization.

1978674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329784.

The product of its digits is 84672, while the sum is 42.

The square root of 1978674 is about 1406.6534754516. The cubic root of 1978674 is about 125.5426858602.

The spelling of 1978674 in words is "one million, nine hundred seventy-eight thousand, six hundred seventy-four".