16389013 has 4 divisors (see below), whose sum is σ = 16403500. Its totient is φ = 16374528.

The previous prime is 16388989. The next prime is 16389019. The reversal of 16389013 is 31098361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31098361 = 7 ⋅4442623.

It can be written as a sum of positive squares in 2 ways, for example, as 8334769 + 8054244 = 2887^2 + 2838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16389013 is a prime.

It is a super-2 number, since 2×16389013² = 537199494228338, 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 (16389019) 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, 5388 + ... + 7861.

It is an arithmetic number, because the mean of its divisors is an integer number (4100875).

Almost surely, 2^16389013 is an apocalyptic number.

It is an amenable number.

16389013 is a deficient number, since it is larger than the sum of its proper divisors (14487).

16389013 is a wasteful number, since it uses less digits than its factorization.

16389013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14486.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 16389013 is about 4048.3345958554. The cubic root of 16389013 is about 254.0100694543.

The spelling of 16389013 in words is "sixteen million, three hundred eighty-nine thousand, thirteen".