1990895471 has 4 divisors (see below), whose sum is σ = 2005218600. Its totient is φ = 1976572344.

The previous prime is 1990895461. The next prime is 1990895503. The reversal of 1990895471 is 1745980991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1745980991 = 23 ⋅75912217.

It is a cyclic number.

It is not a de Polignac number, because 1990895471 - 2¹⁸ = 1990633327 is a prime.

It is a super-3 number, since 3×1990895471³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990895441) 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, 7161356 + ... + 7161633.

It is an arithmetic number, because the mean of its divisors is an integer number (501304650).

Almost surely, 2^1990895471 is an apocalyptic number.

1990895471 is a deficient number, since it is larger than the sum of its proper divisors (14323129).

1990895471 is a wasteful number, since it uses less digits than its factorization.

1990895471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14323128.

The product of its (nonzero) digits is 816480, while the sum is 53.

The square root of 1990895471 is about 44619.4517111091. The cubic root of 1990895471 is about 1258.0063101923.

The spelling of 1990895471 in words is "one billion, nine hundred ninety million, eight hundred ninety-five thousand, four hundred seventy-one".