9945872 has 10 divisors (see below), whose sum is σ = 19270158. Its totient is φ = 4972928.

The previous prime is 9945853. The next prime is 9945877. The reversal of 9945872 is 2785499.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4999696 + 4946176 = 2236^2 + 2224^2 .

It is a d-powerful number, because it can be written as 9⁷ + 9⁷ + 4⁹ + 5 + 8 + 7⁶ + 2⁷ .

It is not an unprimeable number, because it can be changed into a prime (9945877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310793 + ... + 310824.

Almost surely, 2^9945872 is an apocalyptic number.

It is an amenable number.

9945872 is a deficient number, since it is larger than the sum of its proper divisors (9324286).

9945872 is a wasteful number, since it uses less digits than its factorization.

9945872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621625 (or 621619 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 9945872 is about 3153.7076592481. The cubic root of 9945872 is about 215.0540480669.

It can be divided in two parts, 99458 and 72, that multiplied together give a square (7160976 = 2676²).

The spelling of 9945872 in words is "nine million, nine hundred forty-five thousand, eight hundred seventy-two".