9931945 has 8 divisors (see below), whose sum is σ = 11962440. Its totient is φ = 7916160.

The previous prime is 9931921. The next prime is 9931951. The reversal of 9931945 is 5491399.

9931945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1075369 + 8856576 = 1037^2 + 2976^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9931945 - 2⁵ = 9931913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9931898 and 9931907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2130 + ... + 4939.

It is an arithmetic number, because the mean of its divisors is an integer number (1495305).

Almost surely, 2^9931945 is an apocalyptic number.

It is an amenable number.

9931945 is a deficient number, since it is larger than the sum of its proper divisors (2030495).

9931945 is a wasteful number, since it uses less digits than its factorization.

9931945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7355.

The product of its digits is 43740, while the sum is 40.

The square root of 9931945 is about 3151.4988497539. The cubic root of 9931945 is about 214.9536225909.

The spelling of 9931945 in words is "nine million, nine hundred thirty-one thousand, nine hundred forty-five".