9998739 has 6 divisors (see below), whose sum is σ = 14442636. Its totient is φ = 6665820.

The previous prime is 9998719. The next prime is 9998741. The reversal of 9998739 is 9378999.

It is a happy number.

It is not a de Polignac number, because 9998739 - 2²³ = 1610131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9998719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555477 + ... + 555494.

It is an arithmetic number, because the mean of its divisors is an integer number (2407106).

Almost surely, 2^9998739 is an apocalyptic number.

9998739 is a deficient number, since it is larger than the sum of its proper divisors (4443897).

9998739 is a wasteful number, since it uses less digits than its factorization.

9998739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110977 (or 1110974 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 9998739 is about 3162.0782722760. The cubic root of 9998739 is about 215.4344128154.

The spelling of 9998739 in words is "nine million, nine hundred ninety-eight thousand, seven hundred thirty-nine".