16129985 has 8 divisors (see below), whose sum is σ = 19377576. Its totient is φ = 12889600.

The previous prime is 16129963. The next prime is 16130021. The reversal of 16129985 is 58992161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2119936 + 14010049 = 1456^2 + 3743^2 .

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

It is not a de Polignac number, because 16129985 - 2⁶ = 16129921 is a prime.

It is a super-2 number, since 2×16129985² = 520352832200450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7535 + ... + 9435.

It is an arithmetic number, because the mean of its divisors is an integer number (2422197).

Almost surely, 2^16129985 is an apocalyptic number.

It is an amenable number.

16129985 is a deficient number, since it is larger than the sum of its proper divisors (3247591).

16129985 is a wasteful number, since it uses less digits than its factorization.

16129985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603.

The product of its digits is 38880, while the sum is 41.

The square root of 16129985 is about 4016.2152581753. The cubic root of 16129985 is about 252.6647488694.

The spelling of 16129985 in words is "sixteen million, one hundred twenty-nine thousand, nine hundred eighty-five".