1009869 has 16 divisors (see below), whose sum is σ = 1620480. Its totient is φ = 546480.

The previous prime is 1009859. The next prime is 1009873. The reversal of 1009869 is 9689001.

It is a happy number.

It is not a de Polignac number, because 1009869 - 2⁵ = 1009837 is a prime.

It is a super-2 number, since 2×1009869² = 2039670794322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 867 + ... + 1664.

It is an arithmetic number, because the mean of its divisors is an integer number (101280).

2^1009869 is an apocalyptic number.

1009869 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1009869 is a deficient number, since it is larger than the sum of its proper divisors (610611).

1009869 is a wasteful number, since it uses less digits than its factorization.

1009869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1009869 is about 1004.9223850626. The cubic root of 1009869 is about 100.3278903706.

The spelling of 1009869 in words is "one million, nine thousand, eight hundred sixty-nine".