621447 has 8 divisors (see below), whose sum is σ = 842880. Its totient is φ = 407160.

The previous prime is 621443. The next prime is 621451. The reversal of 621447 is 744126.

It is an interprime number because it is at equal distance from previous prime (621443) and next prime (621451).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 621447 - 2² = 621443 is a prime.

621447 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621447.

It is not an unprimeable number, because it can be changed into a prime (621443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579 + ... + 1932.

It is an arithmetic number, because the mean of its divisors is an integer number (105360).

2⁶²¹⁴⁴⁷ is an apocalyptic number.

621447 is a deficient number, since it is larger than the sum of its proper divisors (221433).

621447 is a wasteful number, since it uses less digits than its factorization.

621447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573.

The product of its digits is 1344, while the sum is 24.

The square root of 621447 is about 788.3190978278. The cubic root of 621447 is about 85.3364748328.

The spelling of 621447 in words is "six hundred twenty-one thousand, four hundred forty-seven".