9440259921 has 27 divisors (see below), whose sum is σ = 13793937339. Its totient is φ = 6221413152.

The previous prime is 9440259869. The next prime is 9440259949. The reversal of 9440259921 is 1299520449.

The square root of 9440259921 is 97161.

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., 1917126225 + 7523133696 = 43785^2 + 86736^2 .

It is not a de Polignac number, because 9440259921 - 2⁷ = 9440259793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9440251921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 40516021 + ... + 40516253.

Almost surely, 2^9440259921 is an apocalyptic number.

9440259921 is the 97161-st square number.

9440259921 is the 48581-st centered octagonal number.

It is an amenable number.

9440259921 is a deficient number, since it is larger than the sum of its proper divisors (4353677418).

9440259921 is an equidigital number, since it uses as much as digits as its factorization.

9440259921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The cubic root of 9440259921 is about 2113.4630075279.

It can be divided in two parts, 9440 and 259921, that added together give a square (269361 = 519²).

The spelling of 9440259921 in words is "nine billion, four hundred forty million, two hundred fifty-nine thousand, nine hundred twenty-one".