144619978 has 4 divisors (see below), whose sum is σ = 216929970. Its totient is φ = 72309988.

The previous prime is 144619973. The next prime is 144620009. The reversal of 144619978 is 879916441.

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., 92679129 + 51940849 = 9627^2 + 7207^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (144619973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36154993 + ... + 36154996.

Almost surely, 2^144619978 is an apocalyptic number.

144619978 is a deficient number, since it is larger than the sum of its proper divisors (72309992).

144619978 is an equidigital number, since it uses as much as digits as its factorization.

144619978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72309991.

The product of its digits is 435456, while the sum is 49.

The square root of 144619978 is about 12025.8046716218. The cubic root of 144619978 is about 524.8994250272.

The spelling of 144619978 in words is "one hundred forty-four million, six hundred nineteen thousand, nine hundred seventy-eight".