840254018 has 18 divisors (see below), whose sum is σ = 1279164339. Its totient is φ = 413957412.

The previous prime is 840254003. The next prime is 840254029. The reversal of 840254018 is 810452048.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 420127009 + 420127009 = 20497^2 + 20497^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=20497.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4222283 + ... + 4222481.

Almost surely, 2^840254018 is an apocalyptic number.

840254018 is a deficient number, since it is larger than the sum of its proper divisors (438910321).

840254018 is an equidigital number, since it uses as much as digits as its factorization.

840254018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 840254018 is about 28987.1353879613. The cubic root of 840254018 is about 943.6338959373.

Multiplying 840254018 by its sum of digits (32), we get a square (26888128576 = 163976²).

The spelling of 840254018 in words is "eight hundred forty million, two hundred fifty-four thousand, eighteen".