840454 has 8 divisors (see below), whose sum is σ = 1287648. Its totient is φ = 411240.

The previous prime is 840451. The next prime is 840457. The reversal of 840454 is 454048.

It is an interprime number because it is at equal distance from previous prime (840451) and next prime (840457).

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

It is a super-2 number, since 2×840454² = 1412725852232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4377 + ... + 4564.

It is an arithmetic number, because the mean of its divisors is an integer number (160956).

2⁸⁴⁰⁴⁵⁴ is an apocalyptic number.

840454 is a deficient number, since it is larger than the sum of its proper divisors (447194).

840454 is a wasteful number, since it uses less digits than its factorization.

840454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8990.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 840454 is about 916.7627828397. The cubic root of 840454 is about 94.3708752199.

The spelling of 840454 in words is "eight hundred forty thousand, four hundred fifty-four".