1023855 has 32 divisors (see below), whose sum is σ = 1920000. Its totient is φ = 465696.

The previous prime is 1023851. The next prime is 1023857. The reversal of 1023855 is 5583201.

1023855 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 1023855 - 2² = 1023851 is a prime.

It is a super-2 number, since 2×1023855² = 2096558122050, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023851) 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, 5046 + ... + 5244.

It is an arithmetic number, because the mean of its divisors is an integer number (60000).

2^1023855 is an apocalyptic number.

1023855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1023855 is a deficient number, since it is larger than the sum of its proper divisors (896145).

1023855 is an equidigital number, since it uses as much as digits as its factorization.

1023855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1023855 is about 1011.8572033642. The cubic root of 1023855 is about 100.7889262526.

The spelling of 1023855 in words is "one million, twenty-three thousand, eight hundred fifty-five".