1990969617 has 48 divisors (see below), whose sum is σ = 3403055040. Its totient is φ = 1025716608.

The previous prime is 1990969609. The next prime is 1990969621. The reversal of 1990969617 is 7169690991.

It is not a de Polignac number, because 1990969617 - 2³ = 1990969609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1990969627) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70059 + ... + 94287.

It is an arithmetic number, because the mean of its divisors is an integer number (70896980).

Almost surely, 2^1990969617 is an apocalyptic number.

It is an amenable number.

1990969617 is a deficient number, since it is larger than the sum of its proper divisors (1412085423).

1990969617 is a wasteful number, since it uses less digits than its factorization.

1990969617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24302 (or 24295 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 57.

The square root of 1990969617 is about 44620.2825741837. The cubic root of 1990969617 is about 1258.0219271144.

The spelling of 1990969617 in words is "one billion, nine hundred ninety million, nine hundred sixty-nine thousand, six hundred seventeen".