5781421 has 4 divisors (see below), whose sum is σ = 5827072. Its totient is φ = 5735772.

The previous prime is 5781409. The next prime is 5781431. The reversal of 5781421 is 1241875.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5781421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5781421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5781431) 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 in 3 ways as a sum of consecutive naturals, for example, 22635 + ... + 22888.

It is an arithmetic number, because the mean of its divisors is an integer number (1456768).

Almost surely, 2^5781421 is an apocalyptic number.

It is an amenable number.

5781421 is a deficient number, since it is larger than the sum of its proper divisors (45651).

5781421 is a wasteful number, since it uses less digits than its factorization.

5781421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45650.

The product of its digits is 2240, while the sum is 28.

The square root of 5781421 is about 2404.4585669127. The cubic root of 5781421 is about 179.4781283241.

The spelling of 5781421 in words is "five million, seven hundred eighty-one thousand, four hundred twenty-one".