3918778193 has 8 divisors (see below), whose sum is σ = 4278830880. Its totient is φ = 3559358880.

The previous prime is 3918778163. The next prime is 3918778217.

3918778193 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 3918778193 - 2⁸ = 3918777937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3918778153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145355 + ... + 170192.

It is an arithmetic number, because the mean of its divisors is an integer number (534853860).

Almost surely, 2^3918778193 is an apocalyptic number.

It is an amenable number.

3918778193 is a deficient number, since it is larger than the sum of its proper divisors (360052687).

3918778193 is a wasteful number, since it uses less digits than its factorization.

3918778193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316687.

The product of its digits is 2286144, while the sum is 56.

The square root of 3918778193 is about 62600.1453113329. The cubic root of 3918778193 is about 1576.5831992241.

The spelling of 3918778193 in words is "three billion, nine hundred eighteen million, seven hundred seventy-eight thousand, one hundred ninety-three".