1978208 has 12 divisors (see below), whose sum is σ = 3894660. Its totient is φ = 989088.

The previous prime is 1978201. The next prime is 1978219. The reversal of 1978208 is 8028791.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978201) 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 as a sum of consecutive naturals, namely, 30878 + ... + 30941.

It is an arithmetic number, because the mean of its divisors is an integer number (324555).

2^1978208 is an apocalyptic number.

It is an amenable number.

1978208 is a deficient number, since it is larger than the sum of its proper divisors (1916452).

1978208 is an equidigital number, since it uses as much as digits as its factorization.

1978208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61829 (or 61821 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1978208 is about 1406.4878243341. The cubic root of 1978208 is about 125.5328295145.

The spelling of 1978208 in words is "one million, nine hundred seventy-eight thousand, two hundred eight".