1023861 has 4 divisors (see below), whose sum is σ = 1365152. Its totient is φ = 682572.

The previous prime is 1023857. The next prime is 1023871. The reversal of 1023861 is 1683201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1023861 - 2² = 1023857 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 170641 + ... + 170646.

It is an arithmetic number, because the mean of its divisors is an integer number (341288).

2^1023861 is an apocalyptic number.

It is an amenable number.

1023861 is a deficient number, since it is larger than the sum of its proper divisors (341291).

1023861 is an equidigital number, since it uses as much as digits as its factorization.

1023861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341290.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1023861 is about 1011.8601682051. The cubic root of 1023861 is about 100.7891231335.

It can be divided in two parts, 10 and 23861, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 1023861 in words is "one million, twenty-three thousand, eight hundred sixty-one".