840449 has 8 divisors (see below), whose sum is σ = 883560. Its totient is φ = 798336.

The previous prime is 840439. The next prime is 840451. The reversal of 840449 is 944048.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 211600 + 628849 = 460^2 + 793^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840439) 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, 1919 + ... + 2315.

It is an arithmetic number, because the mean of its divisors is an integer number (110445).

2⁸⁴⁰⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

840449 is a deficient number, since it is larger than the sum of its proper divisors (43111).

840449 is a wasteful number, since it uses less digits than its factorization.

840449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499.

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

The square root of 840449 is about 916.7600558489. The cubic root of 840449 is about 94.3706880769.

The spelling of 840449 in words is "eight hundred forty thousand, four hundred forty-nine".