9967945 has 8 divisors (see below), whose sum is σ = 12881736. Its totient is φ = 7360896.

The previous prime is 9967891. The next prime is 9967987. The reversal of 9967945 is 5497699.

It can be written as a sum of positive squares in 4 ways, for example, as 1394761 + 8573184 = 1181^2 + 2928^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9967945 - 2¹³ = 9959753 is a prime.

It is a Duffinian number.

9967945 is a lucky number.

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, 76612 + ... + 76741.

It is an arithmetic number, because the mean of its divisors is an integer number (1610217).

Almost surely, 2^9967945 is an apocalyptic number.

It is an amenable number.

9967945 is a deficient number, since it is larger than the sum of its proper divisors (2913791).

9967945 is a wasteful number, since it uses less digits than its factorization.

9967945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153371.

The product of its digits is 612360, while the sum is 49.

The square root of 9967945 is about 3157.2052514843. The cubic root of 9967945 is about 215.2130212474.

The spelling of 9967945 in words is "nine million, nine hundred sixty-seven thousand, nine hundred forty-five".