9967618 has 4 divisors (see below), whose sum is σ = 14951430. Its totient is φ = 4983808.

The previous prime is 9967603. The next prime is 9967621. The reversal of 9967618 is 8167699.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9903609 + 64009 = 3147^2 + 253^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2491903 + ... + 2491906.

Almost surely, 2^9967618 is an apocalyptic number.

9967618 is a deficient number, since it is larger than the sum of its proper divisors (4983812).

9967618 is a wasteful number, since it uses less digits than its factorization.

9967618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983811.

The product of its digits is 163296, while the sum is 46.

The square root of 9967618 is about 3157.1534647527. The cubic root of 9967618 is about 215.2106678561.

It can be divided in two parts, 9967 and 618, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 9967618 in words is "nine million, nine hundred sixty-seven thousand, six hundred eighteen".