840440079 has 24 divisors (see below), whose sum is σ = 1268047872. Its totient is φ = 535384080.

The previous prime is 840440077. The next prime is 840440131. The reversal of 840440079 is 970044048.

It is not a de Polignac number, because 840440079 - 2¹ = 840440077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840440071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 323074 + ... + 325664.

It is an arithmetic number, because the mean of its divisors is an integer number (52835328).

Almost surely, 2^840440079 is an apocalyptic number.

840440079 is a deficient number, since it is larger than the sum of its proper divisors (427607793).

840440079 is a wasteful number, since it uses less digits than its factorization.

840440079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187 (or 4184 counting only the distinct ones).

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

The square root of 840440079 is about 28990.3445822915. The cubic root of 840440079 is about 943.7035417447.

The spelling of 840440079 in words is "eight hundred forty million, four hundred forty thousand, seventy-nine".