16407989 has 8 divisors (see below), whose sum is σ = 17710392. Its totient is φ = 15111360.

The previous prime is 16407973. The next prime is 16408027. The reversal of 16407989 is 98970461.

It can be written as a sum of positive squares in 4 ways, for example, as 70225 + 16337764 = 265^2 + 4042^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16407989 - 2⁴ = 16407973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16407929) 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, 5867 + ... + 8199.

It is an arithmetic number, because the mean of its divisors is an integer number (2213799).

Almost surely, 2^16407989 is an apocalyptic number.

It is an amenable number.

16407989 is a deficient number, since it is larger than the sum of its proper divisors (1302403).

16407989 is a wasteful number, since it uses less digits than its factorization.

16407989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 16407989 is about 4050.6775976372. The cubic root of 16407989 is about 254.1080667317.

The spelling of 16407989 in words is "sixteen million, four hundred seven thousand, nine hundred eighty-nine".