16389081 has 8 divisors (see below), whose sum is σ = 24280160. Its totient is φ = 10926036.

The previous prime is 16389059. The next prime is 16389091. The reversal of 16389081 is 18098361.

It is not a de Polignac number, because 16389081 - 2⁹ = 16388569 is a prime.

It is a super-2 number, since 2×16389081² = 537203952049122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16389091) 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, 303475 + ... + 303528.

It is an arithmetic number, because the mean of its divisors is an integer number (3035020).

Almost surely, 2^16389081 is an apocalyptic number.

It is an amenable number.

16389081 is a deficient number, since it is larger than the sum of its proper divisors (7891079).

16389081 is an equidigital number, since it uses as much as digits as its factorization.

16389081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607012 (or 607006 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 16389081 is about 4048.3429943620. The cubic root of 16389081 is about 254.0104207600.

The spelling of 16389081 in words is "sixteen million, three hundred eighty-nine thousand, eighty-one".