8212407138 has 24 divisors (see below), whose sum is σ = 19162283868. Its totient is φ = 2526894432.

The previous prime is 8212407101. The next prime is 8212407139. The reversal of 8212407138 is 8317042128.

8212407138 is a `hidden beast` number, since 8 + 212 + 407 + 1 + 38 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8143799049 + 68608089 = 90243^2 + 8283^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8212407139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17547645 + ... + 17548112.

Almost surely, 2^8212407138 is an apocalyptic number.

8212407138 is an abundant number, since it is smaller than the sum of its proper divisors (10949876730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8212407138 is a wasteful number, since it uses less digits than its factorization.

8212407138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35095778 (or 35095775 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 8212407138 is about 90622.3324462574. The cubic root of 8212407138 is about 2017.5462099300.

The spelling of 8212407138 in words is "eight billion, two hundred twelve million, four hundred seven thousand, one hundred thirty-eight".