1023158 has 4 divisors (see below), whose sum is σ = 1534740. Its totient is φ = 511578.

The previous prime is 1023133. The next prime is 1023163. The reversal of 1023158 is 8513201.

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

It is a congruent number.

It is an unprimeable number.

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, 255788 + ... + 255791.

It is an arithmetic number, because the mean of its divisors is an integer number (383685).

2^1023158 is an apocalyptic number.

1023158 is a deficient number, since it is larger than the sum of its proper divisors (511582).

1023158 is an equidigital number, since it uses as much as digits as its factorization.

1023158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511581.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1023158 is about 1011.5127285408. The cubic root of 1023158 is about 100.7660500222.

Adding to 1023158 its reverse (8513201), we get a palindrome (9536359).

The spelling of 1023158 in words is "one million, twenty-three thousand, one hundred fifty-eight".