1620104399 has 2 divisors, whose sum is σ = 1620104400. Its totient is φ = 1620104398.

The previous prime is 1620104389. The next prime is 1620104411. The reversal of 1620104399 is 9934010261.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620104399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620104359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810052199 + 810052200.

It is an arithmetic number, because the mean of its divisors is an integer number (810052200).

Almost surely, 2^1620104399 is an apocalyptic number.

1620104399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620104399 is an equidigital number, since it uses as much as digits as its factorization.

1620104399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 1620104399 is about 40250.5204811068. The cubic root of 1620104399 is about 1174.4855207141.

The spelling of 1620104399 in words is "one billion, six hundred twenty million, one hundred four thousand, three hundred ninety-nine".