16121764 has 6 divisors (see below), whose sum is σ = 28213094. Its totient is φ = 8060880.

The previous prime is 16121759. The next prime is 16121779. The reversal of 16121764 is 46712161.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 7884864 = 2870^2 + 2808^2 .

It is a super-2 number, since 2×16121764² = 519822548943392, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2015217 + ... + 2015224.

Almost surely, 2^16121764 is an apocalyptic number.

It is an amenable number.

16121764 is a deficient number, since it is larger than the sum of its proper divisors (12091330).

16121764 is a wasteful number, since it uses less digits than its factorization.

16121764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030445 (or 4030443 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 16121764 is about 4015.1916517148. The cubic root of 16121764 is about 252.6218162011.

The spelling of 16121764 in words is "sixteen million, one hundred twenty-one thousand, seven hundred sixty-four".