840220479 has 32 divisors (see below), whose sum is σ = 1426019840. Its totient is φ = 478970496.

The previous prime is 840220441. The next prime is 840220481. The reversal of 840220479 is 974022048.

It is not a de Polignac number, because 840220479 - 2⁹ = 840219967 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840220439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76704 + ... + 86970.

It is an arithmetic number, because the mean of its divisors is an integer number (44563120).

Almost surely, 2^840220479 is an apocalyptic number.

840220479 is a deficient number, since it is larger than the sum of its proper divisors (585799361).

840220479 is a wasteful number, since it uses less digits than its factorization.

840220479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10716 (or 10710 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 840220479 is about 28986.5568669340. The cubic root of 840220479 is about 943.6213406236.

The spelling of 840220479 in words is "eight hundred forty million, two hundred twenty thousand, four hundred seventy-nine".