16238381 has 2 divisors, whose sum is σ = 16238382. Its totient is φ = 16238380.

The previous prime is 16238351. The next prime is 16238399. The reversal of 16238381 is 18383261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15760900 + 477481 = 3970^2 + 691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16238381 is a prime.

It is a super-3 number, since 3×16238381³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16238311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8119190 + 8119191.

It is an arithmetic number, because the mean of its divisors is an integer number (8119191).

Almost surely, 2^16238381 is an apocalyptic number.

It is an amenable number.

16238381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16238381 is an equidigital number, since it uses as much as digits as its factorization.

16238381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 16238381 is about 4029.6874568631. The cubic root of 16238381 is about 253.2294678477.

The spelling of 16238381 in words is "sixteen million, two hundred thirty-eight thousand, three hundred eighty-one".