1992847421 has 2 divisors, whose sum is σ = 1992847422. Its totient is φ = 1992847420.

The previous prime is 1992847393. The next prime is 1992847429. The reversal of 1992847421 is 1247482991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1663824100 + 329023321 = 40790^2 + 18139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992847421 - 2¹⁸ = 1992585277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1992847429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996423710 + 996423711.

It is an arithmetic number, because the mean of its divisors is an integer number (996423711).

Almost surely, 2^1992847421 is an apocalyptic number.

It is an amenable number.

1992847421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992847421 is an equidigital number, since it uses as much as digits as its factorization.

1992847421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 1992847421 is about 44641.3196601534. The cubic root of 1992847421 is about 1258.4173083888.

The spelling of 1992847421 in words is "one billion, nine hundred ninety-two million, eight hundred forty-seven thousand, four hundred twenty-one".