840246290 has 32 divisors (see below), whose sum is σ = 1684957680. Its totient is φ = 299545344.

The previous prime is 840246287. The next prime is 840246299. The reversal of 840246290 is 92642048.

It can be written as a sum of positive squares in 8 ways, for example, as 440286289 + 399960001 = 20983^2 + 19999^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 840246290.

It is not an unprimeable number, because it can be changed into a prime (840246299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107669 + ... + 115208.

Almost surely, 2^840246290 is an apocalyptic number.

840246290 is an abundant number, since it is smaller than the sum of its proper divisors (844711390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840246290 is a wasteful number, since it uses less digits than its factorization.

840246290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222926.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 840246290 is about 28987.0020871424. The cubic root of 840246290 is about 943.6310029926.

The spelling of 840246290 in words is "eight hundred forty million, two hundred forty-six thousand, two hundred ninety".