9915438 has 32 divisors (see below), whose sum is σ = 22288896. Its totient is φ = 2917728.

The previous prime is 9915427. The next prime is 9915457. The reversal of 9915438 is 8345199.

9915438 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 9915396 and 9915405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 970 + ... + 4557.

It is an arithmetic number, because the mean of its divisors is an integer number (696528).

Almost surely, 2^9915438 is an apocalyptic number.

9915438 is an abundant number, since it is smaller than the sum of its proper divisors (12373458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9915438 is a wasteful number, since it uses less digits than its factorization.

9915438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5568.

The product of its digits is 38880, while the sum is 39.

The square root of 9915438 is about 3148.8788480982. The cubic root of 9915438 is about 214.8344714746.

The spelling of 9915438 in words is "nine million, nine hundred fifteen thousand, four hundred thirty-eight".