8391242 has 4 divisors (see below), whose sum is σ = 12586866. Its totient is φ = 4195620.

The previous prime is 8391223. The next prime is 8391263. The reversal of 8391242 is 2421938.

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

It can be written as a sum of positive squares in only one way, i.e., 6405961 + 1985281 = 2531^2 + 1409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2097809 + ... + 2097812.

Almost surely, 2^8391242 is an apocalyptic number.

8391242 is a deficient number, since it is larger than the sum of its proper divisors (4195624).

8391242 is a wasteful number, since it uses less digits than its factorization.

8391242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195623.

The product of its digits is 3456, while the sum is 29.

The square root of 8391242 is about 2896.7640566674. The cubic root of 8391242 is about 203.2085991825.

The spelling of 8391242 in words is "eight million, three hundred ninety-one thousand, two hundred forty-two".