1980415399 has 2 divisors, whose sum is σ = 1980415400. Its totient is φ = 1980415398.

The previous prime is 1980415387. The next prime is 1980415433. The reversal of 1980415399 is 9935140891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1980415399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980415319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990207699 + 990207700.

It is an arithmetic number, because the mean of its divisors is an integer number (990207700).

Almost surely, 2^1980415399 is an apocalyptic number.

1980415399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980415399 is an equidigital number, since it uses as much as digits as its factorization.

1980415399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 1980415399 is about 44501.8583769262. The cubic root of 1980415399 is about 1255.7950442392.

The spelling of 1980415399 in words is "one billion, nine hundred eighty million, four hundred fifteen thousand, three hundred ninety-nine".