8213139 has 24 divisors (see below), whose sum is σ = 13508352. Its totient is φ = 4759920.

The previous prime is 8213131. The next prime is 8213147. The reversal of 8213139 is 9313128.

It is an interprime number because it is at equal distance from previous prime (8213131) and next prime (8213147).

It is not a de Polignac number, because 8213139 - 2³ = 8213131 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8213131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474 + ... + 4080.

It is an arithmetic number, because the mean of its divisors is an integer number (562848).

Almost surely, 2^8213139 is an apocalyptic number.

8213139 is a deficient number, since it is larger than the sum of its proper divisors (5295213).

8213139 is a wasteful number, since it uses less digits than its factorization.

8213139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647 (or 3644 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 8213139 is about 2865.8574633083. The cubic root of 8213139 is about 201.7606140452.

The spelling of 8213139 in words is "eight million, two hundred thirteen thousand, one hundred thirty-nine".