9778945 has 16 divisors (see below), whose sum is σ = 13245120. Its totient is φ = 6865600.

The previous prime is 9778943. The next prime is 9778963. The reversal of 9778945 is 5498779.

It is a happy number.

It is not a de Polignac number, because 9778945 - 2¹ = 9778943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9778943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1471 + ... + 4660.

It is an arithmetic number, because the mean of its divisors is an integer number (827820).

Almost surely, 2^9778945 is an apocalyptic number.

It is an amenable number.

9778945 is a deficient number, since it is larger than the sum of its proper divisors (3466175).

9778945 is a wasteful number, since it uses less digits than its factorization.

9778945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6176.

The product of its digits is 635040, while the sum is 49.

The square root of 9778945 is about 3127.1304737730. The cubic root of 9778945 is about 213.8441305370.

The spelling of 9778945 in words is "nine million, seven hundred seventy-eight thousand, nine hundred forty-five".