1990280471 has 4 divisors (see below), whose sum is σ = 2032626912. Its totient is φ = 1947934032.

The previous prime is 1990280443. The next prime is 1990280473. The reversal of 1990280471 is 1740820991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1990280471 - 2⁶ = 1990280407 is a prime.

It is a super-3 number, since 3×1990280471³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990280473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21173150 + ... + 21173243.

It is an arithmetic number, because the mean of its divisors is an integer number (508156728).

Almost surely, 2^1990280471 is an apocalyptic number.

1990280471 is a deficient number, since it is larger than the sum of its proper divisors (42346441).

1990280471 is an equidigital number, since it uses as much as digits as its factorization.

1990280471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42346440.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1990280471 is about 44612.5595656649. The cubic root of 1990280471 is about 1257.8767615261.

The spelling of 1990280471 in words is "one billion, nine hundred ninety million, two hundred eighty thousand, four hundred seventy-one".