9902440 has 32 divisors (see below), whose sum is σ = 22385160. Its totient is φ = 3942400.

The previous prime is 9902437. The next prime is 9902447. The reversal of 9902440 is 442099.

It can be written as a sum of positive squares in 4 ways, for example, as 7193124 + 2709316 = 2682^2 + 1646^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9902399 and 9902408.

It is not an unprimeable number, because it can be changed into a prime (9902447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10800 + ... + 11680.

Almost surely, 2^9902440 is an apocalyptic number.

It is an amenable number.

9902440 is an abundant number, since it is smaller than the sum of its proper divisors (12482720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9902440 is a wasteful number, since it uses less digits than its factorization.

9902440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173 (or 1169 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 9902440 is about 3146.8142620752. The cubic root of 9902440 is about 214.7405559888.

The spelling of 9902440 in words is "nine million, nine hundred two thousand, four hundred forty".