621449 has 4 divisors (see below), whose sum is σ = 630036. Its totient is φ = 612864.

The previous prime is 621443. The next prime is 621451. The reversal of 621449 is 944126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 944126 = 2 ⋅472063.

It can be written as a sum of positive squares in 2 ways, for example, as 511225 + 110224 = 715^2 + 332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621449 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621449.

It is not an unprimeable number, because it can be changed into a prime (621443) 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 3 ways as a sum of consecutive naturals, for example, 4184 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (157509).

2⁶²¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

621449 is a deficient number, since it is larger than the sum of its proper divisors (8587).

621449 is an equidigital number, since it uses as much as digits as its factorization.

621449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8586.

The product of its digits is 1728, while the sum is 26.

The square root of 621449 is about 788.3203663486. The cubic root of 621449 is about 85.3365663787.

The spelling of 621449 in words is "six hundred twenty-one thousand, four hundred forty-nine".