8158442 has 4 divisors (see below), whose sum is σ = 12237666. Its totient is φ = 4079220.

The previous prime is 8158441. The next prime is 8158457. The reversal of 8158442 is 2448518.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2448518 = 2 ⋅1224259.

It can be written as a sum of positive squares in only one way, i.e., 7295401 + 863041 = 2701^2 + 929^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8158399 and 8158408.

It is not an unprimeable number, because it can be changed into a prime (8158441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039609 + ... + 2039612.

Almost surely, 2^8158442 is an apocalyptic number.

8158442 is a deficient number, since it is larger than the sum of its proper divisors (4079224).

8158442 is a wasteful number, since it uses less digits than its factorization.

8158442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079223.

The product of its digits is 10240, while the sum is 32.

The square root of 8158442 is about 2856.2986538526. The cubic root of 8158442 is about 201.3117280394.

The spelling of 8158442 in words is "eight million, one hundred fifty-eight thousand, four hundred forty-two".