1008423891 has 32 divisors (see below), whose sum is σ = 1567019520. Its totient is φ = 639711072.

The previous prime is 1008423853. The next prime is 1008423947. The reversal of 1008423891 is 1983248001.

It is not a de Polignac number, because 1008423891 - 2¹³ = 1008415699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1008423991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118216 + ... + 126458.

It is an arithmetic number, because the mean of its divisors is an integer number (48969360).

Almost surely, 2^1008423891 is an apocalyptic number.

1008423891 is a deficient number, since it is larger than the sum of its proper divisors (558595629).

1008423891 is a wasteful number, since it uses less digits than its factorization.

1008423891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8472 (or 8466 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1008423891 is about 31755.6906868674. The cubic root of 1008423891 is about 1002.8001157005.

The spelling of 1008423891 in words is "one billion, eight million, four hundred twenty-three thousand, eight hundred ninety-one".