1813948078 has 4 divisors (see below), whose sum is σ = 2720922120. Its totient is φ = 906974038.

The previous prime is 1813948067. The next prime is 1813948079. The reversal of 1813948078 is 8708493181.

It is a semiprime because it is the product of two primes.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813948079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453487018 + ... + 453487021.

It is an arithmetic number, because the mean of its divisors is an integer number (680230530).

Almost surely, 2^1813948078 is an apocalyptic number.

1813948078 is a deficient number, since it is larger than the sum of its proper divisors (906974042).

1813948078 is an equidigital number, since it uses as much as digits as its factorization.

1813948078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906974041.

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 1813948078 is about 42590.4693329388. The cubic root of 1813948078 is about 1219.5743561285.

The spelling of 1813948078 in words is "one billion, eight hundred thirteen million, nine hundred forty-eight thousand, seventy-eight".