1220194678 has 4 divisors (see below), whose sum is σ = 1830292020. Its totient is φ = 610097338.

The previous prime is 1220194639. The next prime is 1220194693. The reversal of 1220194678 is 8764910221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8764910221 = 659 ⋅13300319.

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 1220194678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305048668 + ... + 305048671.

It is an arithmetic number, because the mean of its divisors is an integer number (457573005).

Almost surely, 2^1220194678 is an apocalyptic number.

1220194678 is a deficient number, since it is larger than the sum of its proper divisors (610097342).

1220194678 is an equidigital number, since it uses as much as digits as its factorization.

1220194678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610097341.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1220194678 is about 34931.2850894438. The cubic root of 1220194678 is about 1068.5865629814.

The spelling of 1220194678 in words is "one billion, two hundred twenty million, one hundred ninety-four thousand, six hundred seventy-eight".