840020379 has 8 divisors (see below), whose sum is σ = 1221847872. Its totient is φ = 509103240.

The previous prime is 840020353. The next prime is 840020387. The reversal of 840020379 is 973020048.

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

It is not a de Polignac number, because 840020379 - 2²⁰ = 838971803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 25455163 = 840020379 / (8 + 4 + 0 + 0 + 2 + 0 + 3 + 7 + 9).

It is not an unprimeable number, because it can be changed into a prime (840021379) 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, 12727549 + ... + 12727614.

It is an arithmetic number, because the mean of its divisors is an integer number (152730984).

Almost surely, 2^840020379 is an apocalyptic number.

840020379 is a deficient number, since it is larger than the sum of its proper divisors (381827493).

840020379 is a wasteful number, since it uses less digits than its factorization.

840020379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25455177.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 840020379 is about 28983.1050613974. The cubic root of 840020379 is about 943.5464263100.

The spelling of 840020379 in words is "eight hundred forty million, twenty thousand, three hundred seventy-nine".