19424381 has 2 divisors, whose sum is σ = 19424382. Its totient is φ = 19424380.

The previous prime is 19424369. The next prime is 19424389. The reversal of 19424381 is 18342491.

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., 16564900 + 2859481 = 4070^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 19424381 - 2¹⁰ = 19423357 is a prime.

It is a super-2 number, since 2×19424381² = 754613154466322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19424389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9712190 + 9712191.

It is an arithmetic number, because the mean of its divisors is an integer number (9712191).

Almost surely, 2^19424381 is an apocalyptic number.

It is an amenable number.

19424381 is a deficient number, since it is larger than the sum of its proper divisors (1).

19424381 is an equidigital number, since it uses as much as digits as its factorization.

19424381 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 19424381 is about 4407.3099505254. The cubic root of 19424381 is about 268.8122541197.

The spelling of 19424381 in words is "nineteen million, four hundred twenty-four thousand, three hundred eighty-one".