840900306 has 8 divisors (see below), whose sum is σ = 1681800624. Its totient is φ = 280300100.

The previous prime is 840900287. The next prime is 840900349. The reversal of 840900306 is 603009048.

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

840900306 is an admirable number.

It is a super-2 number, since 2×840900306² = 1414226649261787272, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70075020 + ... + 70075031.

It is an arithmetic number, because the mean of its divisors is an integer number (210225078).

Almost surely, 2^840900306 is an apocalyptic number.

840900306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

840900306 is a wasteful number, since it uses less digits than its factorization.

840900306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140150056.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 840900306 is about 28998.2810869886. The cubic root of 840900306 is about 943.8757684178.

The spelling of 840900306 in words is "eight hundred forty million, nine hundred thousand, three hundred six".