5720421 has 16 divisors (see below), whose sum is σ = 8764928. Its totient is φ = 3250800.

The previous prime is 5720413. The next prime is 5720423. The reversal of 5720421 is 1240275.

It is not a de Polignac number, because 5720421 - 2³ = 5720413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

5720421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5720423) 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, 3786 + ... + 5076.

It is an arithmetic number, because the mean of its divisors is an integer number (547808).

Almost surely, 2^5720421 is an apocalyptic number.

It is an amenable number.

5720421 is a deficient number, since it is larger than the sum of its proper divisors (3044507).

5720421 is a wasteful number, since it uses less digits than its factorization.

5720421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 5720421 is about 2391.7401614724. The cubic root of 5720421 is about 178.8446682588.

Adding to 5720421 its reverse (1240275), we get a palindrome (6960696).

The spelling of 5720421 in words is "five million, seven hundred twenty thousand, four hundred twenty-one".