840369 has 8 divisors (see below), whose sum is σ = 1124992. Its totient is φ = 558000.

The previous prime is 840353. The next prime is 840439. The reversal of 840369 is 963048.

840369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 840369 - 2⁴ = 840353 is a prime.

It is a super-2 number, since 2×840369² = 1412440112322, which contains 22 as substring.

It is a Duffinian number.

840369 is a lucky number.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840369.

It is not an unprimeable number, because it can be changed into a prime (840319) 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, 744 + ... + 1494.

It is an arithmetic number, because the mean of its divisors is an integer number (140624).

2⁸⁴⁰³⁶⁹ is an apocalyptic number.

It is an amenable number.

840369 is a deficient number, since it is larger than the sum of its proper divisors (284623).

840369 is a wasteful number, since it uses less digits than its factorization.

840369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 840369 is about 916.7164228921. The cubic root of 840369 is about 94.3676936876.

The spelling of 840369 in words is "eight hundred forty thousand, three hundred sixty-nine".