9967731 has 4 divisors (see below), whose sum is σ = 13290312. Its totient is φ = 6645152.

The previous prime is 9967721. The next prime is 9967759. The reversal of 9967731 is 1377699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1377699 = 3 ⋅459233.

It is a cyclic number.

It is not a de Polignac number, because 9967731 - 2⁷ = 9967603 is a prime.

It is a super-2 number, since 2×9967731² = 198711322576722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9967721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661286 + ... + 1661291.

It is an arithmetic number, because the mean of its divisors is an integer number (3322578).

Almost surely, 2^9967731 is an apocalyptic number.

9967731 is a deficient number, since it is larger than the sum of its proper divisors (3322581).

9967731 is a wasteful number, since it uses less digits than its factorization.

9967731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322580.

The product of its digits is 71442, while the sum is 42.

The square root of 9967731 is about 3157.1713605695. The cubic root of 9967731 is about 215.2114811133.

The spelling of 9967731 in words is "nine million, nine hundred sixty-seven thousand, seven hundred thirty-one".