1978994 has 12 divisors (see below), whose sum is σ = 3029082. Its totient is φ = 969600.

The previous prime is 1978993. The next prime is 1978997. The reversal of 1978994 is 4998791.

It can be written as a sum of positive squares in 3 ways, for example, as 1923769 + 55225 = 1387^2 + 235^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978993) 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, 19544 + ... + 19644.

2^1978994 is an apocalyptic number.

1978994 is a deficient number, since it is larger than the sum of its proper divisors (1050088).

1978994 is an equidigital number, since it uses as much as digits as its factorization.

1978994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 200 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 1978994 is about 1406.7672159956. The cubic root of 1978994 is about 125.5494532701.

The spelling of 1978994 in words is "one million, nine hundred seventy-eight thousand, nine hundred ninety-four".