38491447 has 2 divisors, whose sum is σ = 38491448. Its totient is φ = 38491446.

The previous prime is 38491441. The next prime is 38491457. The reversal of 38491447 is 74419483.

It is a weak prime.

It is an emirp because it is prime and its reverse (74419483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38491447 - 2¹⁹ = 37967159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38491441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19245723 + 19245724.

It is an arithmetic number, because the mean of its divisors is an integer number (19245724).

Almost surely, 2^38491447 is an apocalyptic number.

38491447 is a deficient number, since it is larger than the sum of its proper divisors (1).

38491447 is an equidigital number, since it uses as much as digits as its factorization.

38491447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 38491447 is about 6204.1475643315. The cubic root of 38491447 is about 337.6406641821.

Subtracting 38491447 from its reverse (74419483), we obtain a square (35928036 = 5994²).

The spelling of 38491447 in words is "thirty-eight million, four hundred ninety-one thousand, four hundred forty-seven".