840458813 has 4 divisors (see below), whose sum is σ = 840909888. Its totient is φ = 840007740.

The previous prime is 840458809. The next prime is 840458851. The reversal of 840458813 is 318854048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 840458813 - 2² = 840458809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840458803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222731 + ... + 226472.

It is an arithmetic number, because the mean of its divisors is an integer number (210227472).

Almost surely, 2^840458813 is an apocalyptic number.

It is an amenable number.

840458813 is a deficient number, since it is larger than the sum of its proper divisors (451075).

840458813 is a wasteful number, since it uses less digits than its factorization.

840458813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451074.

The product of its (nonzero) digits is 122880, while the sum is 41.

The square root of 840458813 is about 28990.6676880682. The cubic root of 840458813 is about 943.7105536310.

The spelling of 840458813 in words is "eight hundred forty million, four hundred fifty-eight thousand, eight hundred thirteen".