9998949 has 4 divisors (see below), whose sum is σ = 13331936. Its totient is φ = 6665964.

The previous prime is 9998929. The next prime is 9998969. The reversal of 9998949 is 9498999.

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: 9498999 = 3 ⋅3166333.

It is an interprime number because it is at equal distance from previous prime (9998929) and next prime (9998969).

It is not a de Polignac number, because 9998949 - 2²⁰ = 8950373 is a prime.

It is a super-2 number, since 2×9998949² = 199957962209202, which contains 22 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 (9998929) 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, 1666489 + ... + 1666494.

It is an arithmetic number, because the mean of its divisors is an integer number (3332984).

Almost surely, 2^9998949 is an apocalyptic number.

It is an amenable number.

9998949 is a deficient number, since it is larger than the sum of its proper divisors (3332987).

9998949 is a wasteful number, since it uses less digits than its factorization.

9998949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332986.

The product of its digits is 1889568, while the sum is 57.

The square root of 9998949 is about 3162.1114781108. Note that the first 3 decimals coincide. The cubic root of 9998949 is about 215.4359210359.

The spelling of 9998949 in words is "nine million, nine hundred ninety-eight thousand, nine hundred forty-nine".