840447813 has 8 divisors (see below), whose sum is σ = 1138967776. Its totient is φ = 551113200.

The previous prime is 840447787. The next prime is 840447821. The reversal of 840447813 is 318744048.

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

It is not a de Polignac number, because 840447813 - 2¹⁴ = 840431429 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 (840447823) 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 7 ways as a sum of consecutive naturals, for example, 2296123 + ... + 2296488.

It is an arithmetic number, because the mean of its divisors is an integer number (142370972).

Almost surely, 2^840447813 is an apocalyptic number.

It is an amenable number.

840447813 is a deficient number, since it is larger than the sum of its proper divisors (298519963).

840447813 is a wasteful number, since it uses less digits than its factorization.

840447813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4592675.

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 840447813 is about 28990.4779712236. The cubic root of 840447813 is about 943.7064364904.

The spelling of 840447813 in words is "eight hundred forty million, four hundred forty-seven thousand, eight hundred thirteen".