840451398 has 16 divisors (see below), whose sum is σ = 1683186240. Its totient is φ = 279769896.

The previous prime is 840451373. The next prime is 840451421. The reversal of 840451398 is 893154048.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90340 + ... + 99207.

It is an arithmetic number, because the mean of its divisors is an integer number (105199140).

Almost surely, 2^840451398 is an apocalyptic number.

840451398 is an abundant number, since it is smaller than the sum of its proper divisors (842734842).

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

840451398 is a wasteful number, since it uses less digits than its factorization.

840451398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190291.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 840451398 is about 28990.5398018043. The cubic root of 840451398 is about 943.7077783079.

The spelling of 840451398 in words is "eight hundred forty million, four hundred fifty-one thousand, three hundred ninety-eight".