16456389 has 8 divisors (see below), whose sum is σ = 21964320. Its totient is φ = 10959696.

The previous prime is 16456331. The next prime is 16456417. The reversal of 16456389 is 98365461.

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

It is not a de Polignac number, because 16456389 - 2⁹ = 16455877 is a prime.

It is a super-3 number, since 3×16456389³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16456389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16456589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1599 + ... + 5955.

It is an arithmetic number, because the mean of its divisors is an integer number (2745540).

Almost surely, 2^16456389 is an apocalyptic number.

It is an amenable number.

16456389 is a deficient number, since it is larger than the sum of its proper divisors (5507931).

16456389 is a wasteful number, since it uses less digits than its factorization.

16456389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5619.

The product of its digits is 155520, while the sum is 42.

The square root of 16456389 is about 4056.6475074869. The cubic root of 16456389 is about 254.3576759769.

The spelling of 16456389 in words is "sixteen million, four hundred fifty-six thousand, three hundred eighty-nine".