1990847399 has 2 divisors, whose sum is σ = 1990847400. Its totient is φ = 1990847398.

The previous prime is 1990847387. The next prime is 1990847491. The reversal of 1990847399 is 9937480991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1990847399 - 2¹² = 1990843303 is a prime.

It is a super-2 number, since 2×1990847399² = 7926946732210130402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990847329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995423699 + 995423700.

It is an arithmetic number, because the mean of its divisors is an integer number (995423700).

Almost surely, 2^1990847399 is an apocalyptic number.

1990847399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990847399 is an equidigital number, since it uses as much as digits as its factorization.

1990847399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 59.

The square root of 1990847399 is about 44618.9130190326. The cubic root of 1990847399 is about 1257.9961848715.

The spelling of 1990847399 in words is "one billion, nine hundred ninety million, eight hundred forty-seven thousand, three hundred ninety-nine".