1089869 has 4 divisors (see below), whose sum is σ = 1188960. Its totient is φ = 990780.

The previous prime is 1089863. The next prime is 1089877. The reversal of 1089869 is 9689801.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089869 is a prime.

It is a super-2 number, since 2×1089869² = 2375628874322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089863) 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, 49529 + ... + 49550.

It is an arithmetic number, because the mean of its divisors is an integer number (297240).

2^1089869 is an apocalyptic number.

It is an amenable number.

1089869 is a deficient number, since it is larger than the sum of its proper divisors (99091).

1089869 is an equidigital number, since it uses as much as digits as its factorization.

1089869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99090.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1089869 is about 1043.9679113843. The cubic root of 1089869 is about 102.9101236277.

The spelling of 1089869 in words is "one million, eighty-nine thousand, eight hundred sixty-nine".