16390081 has 8 divisors (see below), whose sum is σ = 16645824. Its totient is φ = 16136400.

The previous prime is 16390079. The next prime is 16390097. The reversal of 16390081 is 18009361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16390081 - 2¹ = 16390079 is a prime.

It is a super-2 number, since 2×16390081² = 537269510373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16390021) 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 7 ways as a sum of consecutive naturals, for example, 23031 + ... + 23731.

It is an arithmetic number, because the mean of its divisors is an integer number (2080728).

Almost surely, 2^16390081 is an apocalyptic number.

It is an amenable number.

16390081 is a deficient number, since it is larger than the sum of its proper divisors (255743).

16390081 is a wasteful number, since it uses less digits than its factorization.

16390081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 16390081 is about 4048.4664997996. The cubic root of 16390081 is about 254.0155869080.

The spelling of 16390081 in words is "sixteen million, three hundred ninety thousand, eighty-one".