840031 has 8 divisors (see below), whose sum is σ = 874944. Its totient is φ = 805920.

The previous prime is 840023. The next prime is 840053. The reversal of 840031 is 130048.

840031 = 110² + 111² + ... + 156².

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

It is a cyclic number.

It is not a de Polignac number, because 840031 - 2³ = 840023 is a prime.

It is a super-2 number, since 2×840031² = 1411304161922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 839987 and 840014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840061) 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, 2721 + ... + 3013.

It is an arithmetic number, because the mean of its divisors is an integer number (109368).

2⁸⁴⁰⁰³¹ is an apocalyptic number.

840031 is a deficient number, since it is larger than the sum of its proper divisors (34913).

840031 is a wasteful number, since it uses less digits than its factorization.

840031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 840031 is about 916.5320507216. The cubic root of 840031 is about 94.3550402945.

Adding to 840031 its reverse (130048), we get a palindrome (970079).

The spelling of 840031 in words is "eight hundred forty thousand, thirty-one".