19238381 has 2 divisors, whose sum is σ = 19238382. Its totient is φ = 19238380.

The previous prime is 19238353. The next prime is 19238399. The reversal of 19238381 is 18383291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16532356 + 2706025 = 4066^2 + 1645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19238381 is a prime.

It is a super-2 number, since 2×19238381² = 740230607002322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19238081) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9619190 + 9619191.

It is an arithmetic number, because the mean of its divisors is an integer number (9619191).

Almost surely, 2^19238381 is an apocalyptic number.

19238381 is the 2345-th centered heptagonal number.

It is an amenable number.

19238381 is a deficient number, since it is larger than the sum of its proper divisors (1).

19238381 is an equidigital number, since it uses as much as digits as its factorization.

19238381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 19238381 is about 4386.1578858951. The cubic root of 19238381 is about 267.9514883976.

The spelling of 19238381 in words is "nineteen million, two hundred thirty-eight thousand, three hundred eighty-one".