961978 has 4 divisors (see below), whose sum is σ = 1442970. Its totient is φ = 480988.

The previous prime is 961973. The next prime is 961981. The reversal of 961978 is 879169.

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., 734449 + 227529 = 857^2 + 477^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 961978.

It is not an unprimeable number, because it can be changed into a prime (961973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 240493 + ... + 240496.

2⁹⁶¹⁹⁷⁸ is an apocalyptic number.

961978 is a deficient number, since it is larger than the sum of its proper divisors (480992).

961978 is a wasteful number, since it uses less digits than its factorization.

961978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480991.

The product of its digits is 27216, while the sum is 40.

The square root of 961978 is about 980.8047716034. The cubic root of 961978 is about 98.7161888199.

The spelling of 961978 in words is "nine hundred sixty-one thousand, nine hundred seventy-eight".