16842391 has 4 divisors (see below), whose sum is σ = 16891000. Its totient is φ = 16793784.

The previous prime is 16842361. The next prime is 16842421. The reversal of 16842391 is 19324861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19324861 = 61 ⋅316801.

It is an interprime number because it is at equal distance from previous prime (16842361) and next prime (16842421).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16842391 is a prime.

It is a super-2 number, since 2×16842391² = 567332269193762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16842361) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 23781 + ... + 24478.

It is an arithmetic number, because the mean of its divisors is an integer number (4222750).

Almost surely, 2^16842391 is an apocalyptic number.

16842391 is a deficient number, since it is larger than the sum of its proper divisors (48609).

16842391 is an equidigital number, since it uses as much as digits as its factorization.

16842391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48608.

The product of its digits is 10368, while the sum is 34.

The square root of 16842391 is about 4103.9482209209. The cubic root of 16842391 is about 256.3310688571.

The spelling of 16842391 in words is "sixteen million, eight hundred forty-two thousand, three hundred ninety-one".