8210139 has 8 divisors (see below), whose sum is σ = 12510720. Its totient is φ = 4691496.

The previous prime is 8210131. The next prime is 8210141. The reversal of 8210139 is 9310128.

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

It is not a de Polignac number, because 8210139 - 2³ = 8210131 is a prime.

8210139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8210131) 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, 195459 + ... + 195500.

It is an arithmetic number, because the mean of its divisors is an integer number (1563840).

Almost surely, 2^8210139 is an apocalyptic number.

8210139 is a deficient number, since it is larger than the sum of its proper divisors (4300581).

8210139 is a wasteful number, since it uses less digits than its factorization.

8210139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390969.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 8210139 is about 2865.3340119435. The cubic root of 8210139 is about 201.7360454625.

The spelling of 8210139 in words is "eight million, two hundred ten thousand, one hundred thirty-nine".