1219978 has 4 divisors (see below), whose sum is σ = 1829970. Its totient is φ = 609988.

The previous prime is 1219963. The next prime is 1219991. The reversal of 1219978 is 8799121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8799121 = 1699 ⋅5179.

It can be written as a sum of positive squares in only one way, i.e., 1172889 + 47089 = 1083^2 + 217^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304993 + ... + 304996.

2^1219978 is an apocalyptic number.

1219978 is a deficient number, since it is larger than the sum of its proper divisors (609992).

1219978 is an equidigital number, since it uses as much as digits as its factorization.

1219978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609991.

The product of its digits is 9072, while the sum is 37.

The square root of 1219978 is about 1104.5261427418. The cubic root of 1219978 is about 106.8523307254.

It can be divided in two parts, 1219 and 978, that added together give a cube (2197 = 13³).

The spelling of 1219978 in words is "one million, two hundred nineteen thousand, nine hundred seventy-eight".