1992438647 has 2 divisors, whose sum is σ = 1992438648. Its totient is φ = 1992438646.

The previous prime is 1992438619. The next prime is 1992438661. The reversal of 1992438647 is 7468342991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1992438647 - 2⁸ = 1992438391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1992438047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996219323 + 996219324.

It is an arithmetic number, because the mean of its divisors is an integer number (996219324).

Almost surely, 2^1992438647 is an apocalyptic number.

1992438647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992438647 is an equidigital number, since it uses as much as digits as its factorization.

1992438647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 1992438647 is about 44636.7409988677. The cubic root of 1992438647 is about 1258.3312600797.

The spelling of 1992438647 in words is "one billion, nine hundred ninety-two million, four hundred thirty-eight thousand, six hundred forty-seven".