8121438 has 64 divisors (see below), whose sum is σ = 20321280. Its totient is φ = 2385504.

The previous prime is 8121433. The next prime is 8121439. The reversal of 8121438 is 8341218.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15895 + ... + 16397.

It is an arithmetic number, because the mean of its divisors is an integer number (317520).

Almost surely, 2^8121438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8121438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10160640).

8121438 is an abundant number, since it is smaller than the sum of its proper divisors (12199842).

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

8121438 is a wasteful number, since it uses less digits than its factorization.

8121438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 544 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 8121438 is about 2849.8136781200. The cubic root of 8121438 is about 201.0069055324.

The spelling of 8121438 in words is "eight million, one hundred twenty-one thousand, four hundred thirty-eight".