621247 has 4 divisors (see below), whose sum is σ = 677736. Its totient is φ = 564760.

The previous prime is 621241. The next prime is 621259. The reversal of 621247 is 742126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621247 - 2³ = 621239 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28228 + ... + 28249.

It is an arithmetic number, because the mean of its divisors is an integer number (169434).

2⁶²¹²⁴⁷ is an apocalyptic number.

621247 is a deficient number, since it is larger than the sum of its proper divisors (56489).

621247 is a wasteful number, since it uses less digits than its factorization.

621247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56488.

The product of its digits is 672, while the sum is 22.

The square root of 621247 is about 788.1922354350. The cubic root of 621247 is about 85.3273192512.

It can be divided in two parts, 621 and 247, that added together give a palindrome (868).

The spelling of 621247 in words is "six hundred twenty-one thousand, two hundred forty-seven".