8158438 has 4 divisors (see below), whose sum is σ = 12237660. Its totient is φ = 4079218.

The previous prime is 8158421. The next prime is 8158439. The reversal of 8158438 is 8348518.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8348518 = 2 ⋅4174259.

It is a super-2 number, since 2×8158438² = 133120221199688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8158397 and 8158406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8158439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039608 + ... + 2039611.

It is an arithmetic number, because the mean of its divisors is an integer number (3059415).

Almost surely, 2^8158438 is an apocalyptic number.

8158438 is a deficient number, since it is larger than the sum of its proper divisors (4079222).

8158438 is a wasteful number, since it uses less digits than its factorization.

8158438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079221.

The product of its digits is 30720, while the sum is 37.

The square root of 8158438 is about 2856.2979536456. The cubic root of 8158438 is about 201.3116951391.

The spelling of 8158438 in words is "eight million, one hundred fifty-eight thousand, four hundred thirty-eight".