840969 has 8 divisors (see below), whose sum is σ = 1245920. Its totient is φ = 560628.

The previous prime is 840967. The next prime is 840979. The reversal of 840969 is 969048.

It is not a de Polignac number, because 840969 - 2¹ = 840967 is a prime.

It is a super-2 number, since 2×840969² = 1414457717922, which contains 22 as substring.

It is a Duffinian number.

840969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (840967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15547 + ... + 15600.

It is an arithmetic number, because the mean of its divisors is an integer number (155740).

2⁸⁴⁰⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

840969 is a deficient number, since it is larger than the sum of its proper divisors (404951).

840969 is a wasteful number, since it uses less digits than its factorization.

840969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31156 (or 31150 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 840969 is about 917.0436194642. The cubic root of 840969 is about 94.3901469775.

The spelling of 840969 in words is "eight hundred forty thousand, nine hundred sixty-nine".