8139243 has 24 divisors (see below), whose sum is σ = 13370832. Its totient is φ = 4376064.

The previous prime is 8139221. The next prime is 8139251. The reversal of 8139243 is 3429318.

It is not a de Polignac number, because 8139243 - 2⁵ = 8139211 is a prime.

It is a super-2 number, since 2×8139243² = 132494553226098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8139243.

It is not an unprimeable number, because it can be changed into a prime (8139203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 871 + ... + 4127.

It is an arithmetic number, because the mean of its divisors is an integer number (557118).

Almost surely, 2^8139243 is an apocalyptic number.

8139243 is a deficient number, since it is larger than the sum of its proper divisors (5231589).

8139243 is a wasteful number, since it uses less digits than its factorization.

8139243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291 (or 3284 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 8139243 is about 2852.9358562716. The cubic root of 8139243 is about 201.1536905278.

The spelling of 8139243 in words is "eight million, one hundred thirty-nine thousand, two hundred forty-three".