998642649 has 8 divisors (see below), whose sum is σ = 1374476032. Its totient is φ = 644285520.

The previous prime is 998642647. The next prime is 998642683. The reversal of 998642649 is 946246899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 998642649 - 2¹ = 998642647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998642647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5368954 + ... + 5369139.

It is an arithmetic number, because the mean of its divisors is an integer number (171809504).

Almost surely, 2^998642649 is an apocalyptic number.

It is an amenable number.

998642649 is a deficient number, since it is larger than the sum of its proper divisors (375833383).

998642649 is a wasteful number, since it uses less digits than its factorization.

998642649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10738127.

The product of its digits is 6718464, while the sum is 57.

The square root of 998642649 is about 31601.3077102831. The cubic root of 998642649 is about 999.5473448009.

The spelling of 998642649 in words is "nine hundred ninety-eight million, six hundred forty-two thousand, six hundred forty-nine".