1978364 has 6 divisors (see below), whose sum is σ = 3462144. Its totient is φ = 989180.

The previous prime is 1978363. The next prime is 1978393. The reversal of 1978364 is 4638791.

It is a d-powerful number, because it can be written as 1 + 9⁵ + 7⁷ + 8³ + 3³ + 6⁶ + 4¹⁰ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247292 + ... + 247299.

It is an arithmetic number, because the mean of its divisors is an integer number (577024).

2^1978364 is an apocalyptic number.

It is an amenable number.

1978364 is a deficient number, since it is larger than the sum of its proper divisors (1483780).

1978364 is a wasteful number, since it uses less digits than its factorization.

1978364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494595 (or 494593 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 1978364 is about 1406.5432805285. The cubic root of 1978364 is about 125.5361292360.

The spelling of 1978364 in words is "one million, nine hundred seventy-eight thousand, three hundred sixty-four".