721841418 has 12 divisors (see below), whose sum is σ = 1563989778. Its totient is φ = 240613800.

The previous prime is 721841413. The next prime is 721841443. The reversal of 721841418 is 814148127.

It can be written as a sum of positive squares in only one way, i.e., 711128889 + 10712529 = 26667^2 + 3273^2 .

It is not an unprimeable number, because it can be changed into a prime (721841413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20051133 + ... + 20051168.

Almost surely, 2^721841418 is an apocalyptic number.

721841418 is an abundant number, since it is smaller than the sum of its proper divisors (842148360).

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

721841418 is a wasteful number, since it uses less digits than its factorization.

721841418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40102309 (or 40102306 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 721841418 is about 26867.1066175724. The cubic root of 721841418 is about 897.0443858232.

The spelling of 721841418 in words is "seven hundred twenty-one million, eight hundred forty-one thousand, four hundred eighteen".