898724021 has 8 divisors (see below), whose sum is σ = 986118840. Its totient is φ = 813938112.

The previous prime is 898724003. The next prime is 898724033. The reversal of 898724021 is 120427898.

898724021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 365344996 + 533379025 = 19114^2 + 23095^2 .

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

It is not a de Polignac number, because 898724021 - 2¹⁸ = 898461877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 898724021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (898724621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651506 + ... + 652883.

It is an arithmetic number, because the mean of its divisors is an integer number (123264855).

Almost surely, 2^898724021 is an apocalyptic number.

It is an amenable number.

898724021 is a deficient number, since it is larger than the sum of its proper divisors (87394819).

898724021 is a wasteful number, since it uses less digits than its factorization.

898724021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304455.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 898724021 is about 29978.7261403816. The cubic root of 898724021 is about 965.0328931847.

The spelling of 898724021 in words is "eight hundred ninety-eight million, seven hundred twenty-four thousand, twenty-one".