16290391 has 16 divisors (see below), whose sum is σ = 18678240. Its totient is φ = 14083200.

The previous prime is 16290389. The next prime is 16290401. The reversal of 16290391 is 19309261.

It is a cyclic number.

It is not a de Polignac number, because 16290391 - 2¹ = 16290389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16290331) 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 15 ways as a sum of consecutive naturals, for example, 24621 + ... + 25273.

It is an arithmetic number, because the mean of its divisors is an integer number (1167390).

Almost surely, 2^16290391 is an apocalyptic number.

16290391 is a deficient number, since it is larger than the sum of its proper divisors (2387849).

16290391 is a wasteful number, since it uses less digits than its factorization.

16290391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 16290391 is about 4036.1356518333. The cubic root of 16290391 is about 253.4995364040.

The spelling of 16290391 in words is "sixteen million, two hundred ninety thousand, three hundred ninety-one".