16138965 has 16 divisors (see below), whose sum is σ = 25872768. Its totient is φ = 8590656.

The previous prime is 16138949. The next prime is 16138973. The reversal of 16138965 is 56983161.

It is not a de Polignac number, because 16138965 - 2⁴ = 16138949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12699 + ... + 13911.

It is an arithmetic number, because the mean of its divisors is an integer number (1617048).

Almost surely, 2^16138965 is an apocalyptic number.

16138965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16138965 is a deficient number, since it is larger than the sum of its proper divisors (9733803).

16138965 is a wasteful number, since it uses less digits than its factorization.

16138965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108.

The product of its digits is 38880, while the sum is 39.

The square root of 16138965 is about 4017.3330705830. Note that the first 3 decimals coincide. The cubic root of 16138965 is about 252.7116286096.

The spelling of 16138965 in words is "sixteen million, one hundred thirty-eight thousand, nine hundred sixty-five".