8138220407 has 4 divisors (see below), whose sum is σ = 8138553240. Its totient is φ = 8137887576.

The previous prime is 8138220397. The next prime is 8138220449. The reversal of 8138220407 is 7040228318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7040228318 = 2 ⋅3520114159.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8138220407 is a prime.

It is a super-2 number, since 2×8138220407² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8138220487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126557 + ... + 179702.

It is an arithmetic number, because the mean of its divisors is an integer number (2034638310).

Almost surely, 2^8138220407 is an apocalyptic number.

8138220407 is a deficient number, since it is larger than the sum of its proper divisors (332833).

8138220407 is a wasteful number, since it uses less digits than its factorization.

8138220407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332832.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 8138220407 is about 90212.0857036351. The cubic root of 8138220407 is about 2011.4526603546.

The spelling of 8138220407 in words is "eight billion, one hundred thirty-eight million, two hundred twenty thousand, four hundred seven".