16393421 has 8 divisors (see below), whose sum is σ = 17976000. Its totient is φ = 14826240.

The previous prime is 16393397. The next prime is 16393453. The reversal of 16393421 is 12439361.

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

It is a de Polignac number, because none of the positive numbers 2^k-16393421 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 (16399421) 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, 1556 + ... + 5933.

It is an arithmetic number, because the mean of its divisors is an integer number (2247000).

Almost surely, 2^16393421 is an apocalyptic number.

16393421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16393421 is a deficient number, since it is larger than the sum of its proper divisors (1582579).

16393421 is a wasteful number, since it uses less digits than its factorization.

16393421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7699.

The product of its digits is 3888, while the sum is 29.

The square root of 16393421 is about 4048.8789806563. The cubic root of 16393421 is about 254.0328403195.

The spelling of 16393421 in words is "sixteen million, three hundred ninety-three thousand, four hundred twenty-one".