16870389 has 4 divisors (see below), whose sum is σ = 22493856. Its totient is φ = 11246924.

The previous prime is 16870379. The next prime is 16870421. The reversal of 16870389 is 98307861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98307861 = 3 ⋅32769287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16870389 is a prime.

It is a super-2 number, since 2×16870389² = 569220050022642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16870389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16870349) 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, 2811729 + ... + 2811734.

It is an arithmetic number, because the mean of its divisors is an integer number (5623464).

Almost surely, 2^16870389 is an apocalyptic number.

It is an amenable number.

16870389 is a deficient number, since it is larger than the sum of its proper divisors (5623467).

16870389 is an equidigital number, since it uses as much as digits as its factorization.

16870389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5623466.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 16870389 is about 4107.3579098978. The cubic root of 16870389 is about 256.4730278020.

The spelling of 16870389 in words is "sixteen million, eight hundred seventy thousand, three hundred eighty-nine".