16432989 has 4 divisors (see below), whose sum is σ = 21910656. Its totient is φ = 10955324.

The previous prime is 16432987. The next prime is 16432991. The reversal of 16432989 is 98923461.

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.

It is an interprime number because it is at equal distance from previous prime (16432987) and next prime (16432991).

It is a cyclic number.

It is not a de Polignac number, because 16432989 - 2¹ = 16432987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16432989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16432981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2738829 + ... + 2738834.

It is an arithmetic number, because the mean of its divisors is an integer number (5477664).

Almost surely, 2^16432989 is an apocalyptic number.

It is an amenable number.

16432989 is a deficient number, since it is larger than the sum of its proper divisors (5477667).

16432989 is an equidigital number, since it uses as much as digits as its factorization.

16432989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5477666.

The product of its digits is 93312, while the sum is 42.

The square root of 16432989 is about 4053.7623265308. The cubic root of 16432989 is about 254.2370583257.

It can be divided in two parts, 164 and 32989, that added together give a triangular number (33153 = T₂₅₇).

The spelling of 16432989 in words is "sixteen million, four hundred thirty-two thousand, nine hundred eighty-nine".