1020158 has 4 divisors (see below), whose sum is σ = 1530240. Its totient is φ = 510078.

The previous prime is 1020157. The next prime is 1020163. The reversal of 1020158 is 8510201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8510201 = 7 ⋅1215743.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255038 + ... + 255041.

It is an arithmetic number, because the mean of its divisors is an integer number (382560).

2^1020158 is an apocalyptic number.

1020158 is a deficient number, since it is larger than the sum of its proper divisors (510082).

1020158 is an equidigital number, since it uses as much as digits as its factorization.

1020158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510081.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1020158 is about 1010.0287124632. The cubic root of 1020158 is about 100.6674682820.

Adding to 1020158 its reverse (8510201), we get a palindrome (9530359).

The spelling of 1020158 in words is "one million, twenty thousand, one hundred fifty-eight".