840016 has 10 divisors (see below), whose sum is σ = 1627562. Its totient is φ = 420000.

The previous prime is 839999. The next prime is 840023. The reversal of 840016 is 610048.

840016 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in only one way, i.e., 646416 + 193600 = 804^2 + 440^2 .

It is a junction number, because it is equal to n+sod(n) for n = 839975 and 840002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26235 + ... + 26266.

2⁸⁴⁰⁰¹⁶ is an apocalyptic number.

It is an amenable number.

840016 is a deficient number, since it is larger than the sum of its proper divisors (787546).

840016 is a wasteful number, since it uses less digits than its factorization.

840016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52509 (or 52503 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 840016 is about 916.5238676652. The cubic root of 840016 is about 94.3544786748.

The spelling of 840016 in words is "eight hundred forty thousand, sixteen".