5621905 has 12 divisors (see below), whose sum is σ = 6906420. Its totient is φ = 4393184.

The previous prime is 5621899. The next prime is 5621921. The reversal of 5621905 is 5091265.

5621905 = 22² + 23² + ... + 256².

It can be written as a sum of positive squares in 2 ways, for example, as 3359889 + 2262016 = 1833^2 + 1504^2 .

It is not a de Polignac number, because 5621905 - 2⁵ = 5621873 is a prime.

5621905 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10791 + ... + 11299.

It is an arithmetic number, because the mean of its divisors is an integer number (575535).

Almost surely, 2^5621905 is an apocalyptic number.

It is an amenable number.

5621905 is a deficient number, since it is larger than the sum of its proper divisors (1284515).

5621905 is an equidigital number, since it uses as much as digits as its factorization.

5621905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 5621905 is about 2371.0556720583. The cubic root of 5621905 is about 177.8120412113.

The spelling of 5621905 in words is "five million, six hundred twenty-one thousand, nine hundred five".