1023891 has 32 divisors (see below), whose sum is σ = 1658880. Its totient is φ = 554400.

The previous prime is 1023871. The next prime is 1023941. The reversal of 1023891 is 1983201.

It is a de Polignac number, because none of the positive numbers 2^k-1023891 is a prime.

1023891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1023821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14386 + ... + 14456.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2^1023891 is an apocalyptic number.

1023891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1023891 is a deficient number, since it is larger than the sum of its proper divisors (634989).

1023891 is a wasteful number, since it uses less digits than its factorization.

1023891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1023891 is about 1011.8749922792. The cubic root of 1023891 is about 100.7901075263.

It can be divided in two parts, 102 and 3891, that added together give a palindrome (3993).

The spelling of 1023891 in words is "one million, twenty-three thousand, eight hundred ninety-one".