8139542 has 4 divisors (see below), whose sum is σ = 12209316. Its totient is φ = 4069770.

The previous prime is 8139541. The next prime is 8139553. The reversal of 8139542 is 2459318.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 8139499 and 8139508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8139541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2034884 + ... + 2034887.

It is an arithmetic number, because the mean of its divisors is an integer number (3052329).

Almost surely, 2^8139542 is an apocalyptic number.

8139542 is a deficient number, since it is larger than the sum of its proper divisors (4069774).

8139542 is a wasteful number, since it uses less digits than its factorization.

8139542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069773.

The product of its digits is 8640, while the sum is 32.

The square root of 8139542 is about 2852.9882579499. The cubic root of 8139542 is about 201.1561536650.

The spelling of 8139542 in words is "eight million, one hundred thirty-nine thousand, five hundred forty-two".