16223906 has 4 divisors (see below), whose sum is σ = 24335862. Its totient is φ = 8111952.

The previous prime is 16223903. The next prime is 16223939. The reversal of 16223906 is 60932261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60932261 = 13 ⋅4687097.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 502681 = 3965^2 + 709^2 .

It is not an unprimeable number, because it can be changed into a prime (16223903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4055975 + ... + 4055978.

Almost surely, 2^16223906 is an apocalyptic number.

16223906 is a deficient number, since it is larger than the sum of its proper divisors (8111956).

16223906 is an equidigital number, since it uses as much as digits as its factorization.

16223906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8111955.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 16223906 is about 4027.8910114351. The cubic root of 16223906 is about 253.1542020062.

The spelling of 16223906 in words is "sixteen million, two hundred twenty-three thousand, nine hundred six".