1978312 has 16 divisors (see below), whose sum is σ = 4239360. Its totient is φ = 847824.

The previous prime is 1978297. The next prime is 1978313. The reversal of 1978312 is 2138791.

It is not an unprimeable number, because it can be changed into a prime (1978313) 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, 17608 + ... + 17719.

It is an arithmetic number, because the mean of its divisors is an integer number (264960).

2^1978312 is an apocalyptic number.

It is an amenable number.

1978312 is an abundant number, since it is smaller than the sum of its proper divisors (2261048).

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

1978312 is a wasteful number, since it uses less digits than its factorization.

1978312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35340 (or 35336 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 1978312 is about 1406.5247953733. The cubic root of 1978312 is about 125.5350293481.

The spelling of 1978312 in words is "one million, nine hundred seventy-eight thousand, three hundred twelve".