16938947 has 4 divisors (see below), whose sum is σ = 17332920. Its totient is φ = 16544976.

The previous prime is 16938931. The next prime is 16938979. The reversal of 16938947 is 74983961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74983961 = 13 ⋅5767997.

It is a cyclic number.

It is not a de Polignac number, because 16938947 - 2⁴ = 16938931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16938917) 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, 196922 + ... + 197007.

It is an arithmetic number, because the mean of its divisors is an integer number (4333230).

Almost surely, 2^16938947 is an apocalyptic number.

16938947 is a deficient number, since it is larger than the sum of its proper divisors (393973).

16938947 is an equidigital number, since it uses as much as digits as its factorization.

16938947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393972.

The product of its digits is 326592, while the sum is 47.

The square root of 16938947 is about 4115.6952025144. The cubic root of 16938947 is about 256.8199771841.

The spelling of 16938947 in words is "sixteen million, nine hundred thirty-eight thousand, nine hundred forty-seven".