1977994 has 8 divisors (see below), whose sum is σ = 2973060. Its totient is φ = 986976.

The previous prime is 1977991. The next prime is 1978021. The reversal of 1977994 is 4997791.

It can be written as a sum of positive squares in 2 ways, for example, as 1974025 + 3969 = 1405^2 + 63^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1977991) 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 3 ways as a sum of consecutive naturals, for example, 1062 + ... + 2254.

2^1977994 is an apocalyptic number.

1977994 is a deficient number, since it is larger than the sum of its proper divisors (995066).

1977994 is a wasteful number, since it uses less digits than its factorization.

1977994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024.

The product of its digits is 142884, while the sum is 46.

The square root of 1977994 is about 1406.4117462536. The cubic root of 1977994 is about 125.5283026912.

The spelling of 1977994 in words is "one million, nine hundred seventy-seven thousand, nine hundred ninety-four".