9861945 has 16 divisors (see below), whose sum is σ = 15897600. Its totient is φ = 5220224.

The previous prime is 9861919. The next prime is 9861947. The reversal of 9861945 is 5491689.

It is a cyclic number.

It is not a de Polignac number, because 9861945 - 2⁵ = 9861913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9861897 and 9861906.

It is not an unprimeable number, because it can be changed into a prime (9861947) 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, 345 + ... + 4454.

It is an arithmetic number, because the mean of its divisors is an integer number (993600).

Almost surely, 2^9861945 is an apocalyptic number.

It is an amenable number.

9861945 is a deficient number, since it is larger than the sum of its proper divisors (6035655).

9861945 is a wasteful number, since it uses less digits than its factorization.

9861945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4944.

The product of its digits is 77760, while the sum is 42.

The square root of 9861945 is about 3140.3733854432. The cubic root of 9861945 is about 214.4474363299.

The spelling of 9861945 in words is "nine million, eight hundred sixty-one thousand, nine hundred forty-five".