9978265 has 12 divisors (see below), whose sum is σ = 13162212. Its totient is φ = 7256480.

The previous prime is 9978229. The next prime is 9978277. The reversal of 9978265 is 5628799.

9978265 = T₂₆₂ + T₂₆₃ + ... + T₄₂₆.

It can be written as a sum of positive squares in 2 ways, for example, as 1545049 + 8433216 = 1243^2 + 2904^2 .

It is not a de Polignac number, because 9978265 - 2¹¹ = 9976217 is a prime.

It is a Duffinian number.

9978265 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7642 + ... + 8851.

It is an arithmetic number, because the mean of its divisors is an integer number (1096851).

Almost surely, 2^9978265 is an apocalyptic number.

It is an amenable number.

9978265 is a deficient number, since it is larger than the sum of its proper divisors (3183947).

9978265 is a wasteful number, since it uses less digits than its factorization.

9978265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16520 (or 16509 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 9978265 is about 3158.8391855237. The cubic root of 9978265 is about 215.2872669868.

The spelling of 9978265 in words is "nine million, nine hundred seventy-eight thousand, two hundred sixty-five".