16432389 has 14 divisors (see below), whose sum is σ = 24638406. Its totient is φ = 10954440.

The previous prime is 16432331. The next prime is 16432391. The reversal of 16432389 is 98323461.

16432389 is a `hidden beast` number, since 1 + 643 + 2 + 3 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 893025 = 3942^2 + 945^2 .

It is not a de Polignac number, because 16432389 - 2⁷ = 16432261 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16432309) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 10542 + ... + 11999.

Almost surely, 2^16432389 is an apocalyptic number.

It is an amenable number.

16432389 is a deficient number, since it is larger than the sum of its proper divisors (8206017).

16432389 is an frugal number, since it uses more digits than its factorization.

16432389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22559 (or 22544 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 16432389 is about 4053.6883205298. The cubic root of 16432389 is about 254.2339640603.

The spelling of 16432389 in words is "sixteen million, four hundred thirty-two thousand, three hundred eighty-nine".