16438291 has 2 divisors, whose sum is σ = 16438292. Its totient is φ = 16438290.

The previous prime is 16438283. The next prime is 16438309. The reversal of 16438291 is 19283461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16438291 - 2³ = 16438283 is a prime.

It is a super-2 number, since 2×16438291² = 540434822001362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16432291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8219145 + 8219146.

It is an arithmetic number, because the mean of its divisors is an integer number (8219146).

Almost surely, 2^16438291 is an apocalyptic number.

16438291 is a deficient number, since it is larger than the sum of its proper divisors (1).

16438291 is an equidigital number, since it uses as much as digits as its factorization.

16438291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 16438291 is about 4054.4162341822. The cubic root of 16438291 is about 254.2643980454.

The spelling of 16438291 in words is "sixteen million, four hundred thirty-eight thousand, two hundred ninety-one".