1965920447 has 2 divisors, whose sum is σ = 1965920448. Its totient is φ = 1965920446.

The previous prime is 1965920401. The next prime is 1965920461. The reversal of 1965920447 is 7440295691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965920447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1965929447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982960223 + 982960224.

It is an arithmetic number, because the mean of its divisors is an integer number (982960224).

Almost surely, 2^1965920447 is an apocalyptic number.

1965920447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965920447 is an equidigital number, since it uses as much as digits as its factorization.

1965920447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1965920447 is about 44338.7014582069. The cubic root of 1965920447 is about 1252.7237559719.

The spelling of 1965920447 in words is "one billion, nine hundred sixty-five million, nine hundred twenty thousand, four hundred forty-seven".