990380617 has 4 divisors (see below), whose sum is σ = 995074576. Its totient is φ = 985686660.

The previous prime is 990380609. The next prime is 990380623. The reversal of 990380617 is 716083099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716083099 = 557 ⋅1285607.

It is a cyclic number.

It is not a de Polignac number, because 990380617 - 2³ = 990380609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990380627) 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, 2346663 + ... + 2347084.

It is an arithmetic number, because the mean of its divisors is an integer number (248768644).

Almost surely, 2^990380617 is an apocalyptic number.

It is an amenable number.

990380617 is a deficient number, since it is larger than the sum of its proper divisors (4693959).

990380617 is a wasteful number, since it uses less digits than its factorization.

990380617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4693958.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 990380617 is about 31470.3132650439. The cubic root of 990380617 is about 996.7832023082.

The spelling of 990380617 in words is "nine hundred ninety million, three hundred eighty thousand, six hundred seventeen".