698421909 has 16 divisors (see below), whose sum is σ = 962095104. Its totient is φ = 450207600.

The previous prime is 698421883. The next prime is 698421917. The reversal of 698421909 is 909124896.

It is not a de Polignac number, because 698421909 - 2⁹ = 698421397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698421989) 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, 139174 + ... + 144104.

It is an arithmetic number, because the mean of its divisors is an integer number (60130944).

Almost surely, 2^698421909 is an apocalyptic number.

It is an amenable number.

698421909 is a deficient number, since it is larger than the sum of its proper divisors (263673195).

698421909 is a wasteful number, since it uses less digits than its factorization.

698421909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6488.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 698421909 is about 26427.6731665881. The cubic root of 698421909 is about 887.2362647939.

The spelling of 698421909 in words is "six hundred ninety-eight million, four hundred twenty-one thousand, nine hundred nine".