3918220447 has 4 divisors (see below), whose sum is σ = 3918362680. Its totient is φ = 3918078216.

The previous prime is 3918220403. The next prime is 3918220459. The reversal of 3918220447 is 7440228193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7440228193 = 2557 ⋅2909749.

It is a cyclic number.

It is not a de Polignac number, because 3918220447 - 2²³ = 3909831839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3918226447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15072 + ... + 89797.

It is an arithmetic number, because the mean of its divisors is an integer number (979590670).

Almost surely, 2^3918220447 is an apocalyptic number.

3918220447 is a deficient number, since it is larger than the sum of its proper divisors (142233).

3918220447 is a wasteful number, since it uses less digits than its factorization.

3918220447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142232.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 3918220447 is about 62595.6903228968. The cubic root of 3918220447 is about 1576.5083991503.

The spelling of 3918220447 in words is "three billion, nine hundred eighteen million, two hundred twenty thousand, four hundred forty-seven".