5721381 has 16 divisors (see below), whose sum is σ = 8769600. Its totient is φ = 3682224.

The previous prime is 5721371. The next prime is 5721389. The reversal of 5721381 is 1831275.

5721381 is a `hidden beast` number, since 572 + 13 + 81 = 666.

It is not a de Polignac number, because 5721381 - 2⁵ = 5721349 is a prime.

It is a super-2 number, since 2×5721381² = 65468401094322, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5721389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2871 + ... + 4436.

It is an arithmetic number, because the mean of its divisors is an integer number (548100).

Almost surely, 2^5721381 is an apocalyptic number.

It is an amenable number.

5721381 is a deficient number, since it is larger than the sum of its proper divisors (3048219).

5721381 is a wasteful number, since it uses less digits than its factorization.

5721381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7345 (or 7339 counting only the distinct ones).

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

The square root of 5721381 is about 2391.9408437501. The cubic root of 5721381 is about 178.8546722590.

It can be divided in two parts, 572 and 1381, that added together give a triangular number (1953 = T₆₂).

The spelling of 5721381 in words is "five million, seven hundred twenty-one thousand, three hundred eighty-one".