16004431 has 2 divisors, whose sum is σ = 16004432. Its totient is φ = 16004430.

The previous prime is 16004419. The next prime is 16004437. The reversal of 16004431 is 13440061.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16004431 - 2¹¹ = 16002383 is a prime.

It is a super-2 number, since 2×16004431² = 512283623267522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16004399 and 16004408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16004437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8002215 + 8002216.

It is an arithmetic number, because the mean of its divisors is an integer number (8002216).

Almost surely, 2^16004431 is an apocalyptic number.

16004431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16004431 is an equidigital number, since it uses as much as digits as its factorization.

16004431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 16004431 is about 4000.5538366581. The cubic root of 16004431 is about 252.0074691244.

Adding to 16004431 its reverse (13440061), we get a palindrome (29444492).

The spelling of 16004431 in words is "sixteen million, four thousand, four hundred thirty-one".