16000000 has 77 divisors (see below), whose sum is σ = 39979957.
Its totient is φ = 6400000.
The previous prime is 15999989. The next prime is 16000057. The reversal of 16000000 is 61.
Adding to 16000000 its reverse (61), we get a palindrome (16000061).
The square root of 16000000 is 4000.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in 3 ways, for example, as 14017536 + 1982464 = 3744^2 + 1408^2
It is an ABA number since it can be written as A⋅BA, here for A=5, B=20.
It is a hoax number, since the sum of its digits (7) coincides with the sum of the digits of its distinct prime factors.
It is a Duffinian number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 6 ways as a sum of consecutive naturals, for example, 3199998 + ... + 3200002.
Almost surely, 216000000 is an apocalyptic number.
16000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
16000000 is the 4000-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 16000000
16000000 is an abundant number, since it is smaller than the sum of its proper divisors (23979957).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
16000000 is an frugal number, since it uses more digits than its factorization.
16000000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 50 (or 7 counting only the distinct ones).
The product of its (nonzero) digits is 6, while the sum is 7.
The cubic root of 16000000 is about 251.9842099790.
The spelling of 16000000 in words is "sixteen million", and thus it is an aban number and an uban number.