1990280477 has 2 divisors, whose sum is σ = 1990280478. Its totient is φ = 1990280476.

The previous prime is 1990280473. The next prime is 1990280483. The reversal of 1990280477 is 7740820991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1963021636 + 27258841 = 44306^2 + 5221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990280477 - 2² = 1990280473 is a prime.

It is a super-2 number, since 2×1990280477² = 7922432754254695058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990280473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995140238 + 995140239.

It is an arithmetic number, because the mean of its divisors is an integer number (995140239).

Almost surely, 2^1990280477 is an apocalyptic number.

It is an amenable number.

1990280477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990280477 is an equidigital number, since it uses as much as digits as its factorization.

1990280477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 1990280477 is about 44612.5596329106. The cubic root of 1990280477 is about 1257.8767627901.

The spelling of 1990280477 in words is "one billion, nine hundred ninety million, two hundred eighty thousand, four hundred seventy-seven".