18971324 has 6 divisors (see below), whose sum is σ = 33199824. Its totient is φ = 9485660.

The previous prime is 18971317. The next prime is 18971347. The reversal of 18971324 is 42317981.

It is a super-2 number, since 2×18971324² = 719822268625952, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2371412 + ... + 2371419.

It is an arithmetic number, because the mean of its divisors is an integer number (5533304).

Almost surely, 2^18971324 is an apocalyptic number.

It is an amenable number.

18971324 is a deficient number, since it is larger than the sum of its proper divisors (14228500).

18971324 is a wasteful number, since it uses less digits than its factorization.

18971324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742835 (or 4742833 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 18971324 is about 4355.6083386824. The cubic root of 18971324 is about 266.7058532690.

The spelling of 18971324 in words is "eighteen million, nine hundred seventy-one thousand, three hundred twenty-four".