4278598921 has 9 divisors (see below), whose sum is σ = 4317341511. Its totient is φ = 4240202664.

The previous prime is 4278598901. The next prime is 4278598927. The reversal of 4278598921 is 1298958724.

The square root of 4278598921 is 65411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 501267321 + 3777331600 = 22389^2 + 61460^2 .

It is not a de Polignac number, because 4278598921 - 2¹⁷ = 4278467849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4278598927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9746020 + ... + 9746458.

Almost surely, 2^4278598921 is an apocalyptic number.

4278598921 is the 65411-st square number.

4278598921 is the 32706-th centered octagonal number.

It is an amenable number.

4278598921 is a deficient number, since it is larger than the sum of its proper divisors (38742590).

4278598921 is an frugal number, since it uses more digits than its factorization.

4278598921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176 (or 588 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 55.

The cubic root of 4278598921 is about 1623.4310911459.

The spelling of 4278598921 in words is "four billion, two hundred seventy-eight million, five hundred ninety-eight thousand, nine hundred twenty-one".