840494210 has 16 divisors (see below), whose sum is σ = 1513452600. Its totient is φ = 336072576.

The previous prime is 840494209. The next prime is 840494243. The reversal of 840494210 is 12494048.

It can be written as a sum of positive squares in 4 ways, for example, as 362940601 + 477553609 = 19051^2 + 21853^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15536 + ... + 43844.

Almost surely, 2^840494210 is an apocalyptic number.

840494210 is a deficient number, since it is larger than the sum of its proper divisors (672958390).

840494210 is a wasteful number, since it uses less digits than its factorization.

840494210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31285.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 840494210 is about 28991.2781712018. The cubic root of 840494210 is about 943.7238019715.

The spelling of 840494210 in words is "eight hundred forty million, four hundred ninety-four thousand, two hundred ten".