840386 has 4 divisors (see below), whose sum is σ = 1260582. Its totient is φ = 420192.

The previous prime is 840353. The next prime is 840439. The reversal of 840386 is 683048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 442225 + 398161 = 665^2 + 631^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210095 + ... + 210098.

2⁸⁴⁰³⁸⁶ is an apocalyptic number.

840386 is a deficient number, since it is larger than the sum of its proper divisors (420196).

840386 is a wasteful number, since it uses less digits than its factorization.

840386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420195.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 840386 is about 916.7256950691. The cubic root of 840386 is about 94.3683300112.

The spelling of 840386 in words is "eight hundred forty thousand, three hundred eighty-six".