5197978 has 4 divisors (see below), whose sum is σ = 7796970. Its totient is φ = 2598988.

The previous prime is 5197967. The next prime is 5198003. The reversal of 5197978 is 8797915.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2866249 + 2331729 = 1693^2 + 1527^2 .

It is a nialpdrome in base 14.

It is an unprimeable number.

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, 1299493 + ... + 1299496.

Almost surely, 2^5197978 is an apocalyptic number.

5197978 is a deficient number, since it is larger than the sum of its proper divisors (2598992).

5197978 is a wasteful number, since it uses less digits than its factorization.

5197978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598991.

The product of its digits is 158760, while the sum is 46.

The square root of 5197978 is about 2279.9074542621. The cubic root of 5197978 is about 173.2253625740.

The spelling of 5197978 in words is "five million, one hundred ninety-seven thousand, nine hundred seventy-eight".