1972399447 has 2 divisors, whose sum is σ = 1972399448. Its totient is φ = 1972399446.

The previous prime is 1972399411. The next prime is 1972399529. The reversal of 1972399447 is 7449932791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1972399447 - 2¹⁹ = 1971875159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972399147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986199723 + 986199724.

It is an arithmetic number, because the mean of its divisors is an integer number (986199724).

Almost surely, 2^1972399447 is an apocalyptic number.

1972399447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972399447 is an equidigital number, since it uses as much as digits as its factorization.

1972399447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 55.

The square root of 1972399447 is about 44411.7039416413. The cubic root of 1972399447 is about 1254.0984296400.

The spelling of 1972399447 in words is "one billion, nine hundred seventy-two million, three hundred ninety-nine thousand, four hundred forty-seven".