122978 has 8 divisors (see below), whose sum is σ = 195372. Its totient is φ = 57856.

The previous prime is 122971. The next prime is 123001. The reversal of 122978 is 879221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 117649 + 5329 = 343^2 + 73^2 .

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

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 122978.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1775 + ... + 1842.

2¹²²⁹⁷⁸ is an apocalyptic number.

122978 is a deficient number, since it is larger than the sum of its proper divisors (72394).

122978 is a wasteful number, since it uses less digits than its factorization.

122978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636.

The product of its digits is 2016, while the sum is 29.

The square root of 122978 is about 350.6821923052. The cubic root of 122978 is about 49.7289331105.

It can be divided in two parts, 122 and 978, that multiplied together give a triangular number (119316 = T₄₈₈).

The spelling of 122978 in words is "one hundred twenty-two thousand, nine hundred seventy-eight".