16219945 has 16 divisors (see below), whose sum is σ = 23212800. Its totient is φ = 10638144.

The previous prime is 16219933. The next prime is 16219981. The reversal of 16219945 is 54991261.

It is not a de Polignac number, because 16219945 - 2⁷ = 16219817 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 9270 + ... + 10879.

It is an arithmetic number, because the mean of its divisors is an integer number (1450800).

Almost surely, 2^16219945 is an apocalyptic number.

It is an amenable number.

16219945 is a deficient number, since it is larger than the sum of its proper divisors (6992855).

16219945 is a wasteful number, since it uses less digits than its factorization.

16219945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20184.

The product of its digits is 19440, while the sum is 37.

The square root of 16219945 is about 4027.3992848984. The cubic root of 16219945 is about 253.1335981431.

It can be divided in two parts, 16 and 219945, that added together give a square (219961 = 469²).

The spelling of 16219945 in words is "sixteen million, two hundred nineteen thousand, nine hundred forty-five".