1996978 has 8 divisors (see below), whose sum is σ = 3005100. Its totient is φ = 995280.

The previous prime is 1996949. The next prime is 1996979. The reversal of 1996978 is 8796991.

It can be written as a sum of positive squares in 2 ways, for example, as 1951609 + 45369 = 1397^2 + 213^2 .

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

It is a super-2 number, since 2×1996978² = 7975842264968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1996979) 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, 733 + ... + 2128.

2^1996978 is an apocalyptic number.

1996978 is a deficient number, since it is larger than the sum of its proper divisors (1008122).

1996978 is a wasteful number, since it uses less digits than its factorization.

1996978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212.

The product of its digits is 244944, while the sum is 49.

The square root of 1996978 is about 1413.1447201189. The cubic root of 1996978 is about 125.9286149774.

The spelling of 1996978 in words is "one million, nine hundred ninety-six thousand, nine hundred seventy-eight".