17940947 has 2 divisors, whose sum is σ = 17940948. Its totient is φ = 17940946.

The previous prime is 17940931. The next prime is 17940953. The reversal of 17940947 is 74904971.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74904971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17940947 - 2⁴ = 17940931 is a prime.

It is not a weakly prime, because it can be changed into another prime (17940917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8970473 + 8970474.

It is an arithmetic number, because the mean of its divisors is an integer number (8970474).

Almost surely, 2^17940947 is an apocalyptic number.

17940947 is a deficient number, since it is larger than the sum of its proper divisors (1).

17940947 is an equidigital number, since it uses as much as digits as its factorization.

17940947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 17940947 is about 4235.6755069292. The cubic root of 17940947 is about 261.7872279485.

The spelling of 17940947 in words is "seventeen million, nine hundred forty thousand, nine hundred forty-seven".