16503989 has 8 divisors (see below), whose sum is σ = 17528640. Its totient is φ = 15494976.

The previous prime is 16503953. The next prime is 16504049. The reversal of 16503989 is 98930561.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16503989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16503919) 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, 1697 + ... + 5990.

It is an arithmetic number, because the mean of its divisors is an integer number (2191080).

Almost surely, 2^16503989 is an apocalyptic number.

16503989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16503989 is a deficient number, since it is larger than the sum of its proper divisors (1024651).

16503989 is a wasteful number, since it uses less digits than its factorization.

16503989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7819.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 16503989 is about 4062.5101846026. The cubic root of 16503989 is about 254.6026825525.

The spelling of 16503989 in words is "sixteen million, five hundred three thousand, nine hundred eighty-nine".