9947438 has 4 divisors (see below), whose sum is σ = 14921160. Its totient is φ = 4973718.

The previous prime is 9947437. The next prime is 9947473. The reversal of 9947438 is 8347499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8347499 = 631 ⋅13229.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2486858 + ... + 2486861.

It is an arithmetic number, because the mean of its divisors is an integer number (3730290).

Almost surely, 2^9947438 is an apocalyptic number.

9947438 is a deficient number, since it is larger than the sum of its proper divisors (4973722).

9947438 is a wasteful number, since it uses less digits than its factorization.

9947438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4973721.

The product of its digits is 217728, while the sum is 44.

The square root of 9947438 is about 3153.9559286712. The cubic root of 9947438 is about 215.0653343897.

The spelling of 9947438 in words is "nine million, nine hundred forty-seven thousand, four hundred thirty-eight".