1662820399 has 2 divisors, whose sum is σ = 1662820400. Its totient is φ = 1662820398.

The previous prime is 1662820387. The next prime is 1662820403. The reversal of 1662820399 is 9930282661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1662820399 - 2¹¹ = 1662818351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662820699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831410199 + 831410200.

It is an arithmetic number, because the mean of its divisors is an integer number (831410200).

Almost surely, 2^1662820399 is an apocalyptic number.

1662820399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662820399 is an equidigital number, since it uses as much as digits as its factorization.

1662820399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1662820399 is about 40777.6948710934. The cubic root of 1662820399 is about 1184.7183480833.

The spelling of 1662820399 in words is "one billion, six hundred sixty-two million, eight hundred twenty thousand, three hundred ninety-nine".