5721138 has 32 divisors (see below), whose sum is σ = 12960000. Its totient is φ = 1870128.

The previous prime is 5721127. The next prime is 5721139. The reversal of 5721138 is 8311275.

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

It is not an unprimeable number, because it can be changed into a prime (5721139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1863 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (405000).

Almost surely, 2^5721138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5721138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6480000).

5721138 is an abundant number, since it is smaller than the sum of its proper divisors (7238862).

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

5721138 is a wasteful number, since it uses less digits than its factorization.

5721138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 2057 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 5721138 is about 2391.8900476402. The cubic root of 5721138 is about 178.8521401022.

The spelling of 5721138 in words is "five million, seven hundred twenty-one thousand, one hundred thirty-eight".