621493 has 4 divisors (see below), whose sum is σ = 629440. Its totient is φ = 613548.

The previous prime is 621473. The next prime is 621521. The reversal of 621493 is 394126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 394126 = 2 ⋅197063.

It is a cyclic number.

It is not a de Polignac number, because 621493 - 2⁵ = 621461 is a prime.

It is a Duffinian number.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3855 + ... + 4012.

It is an arithmetic number, because the mean of its divisors is an integer number (157360).

2⁶²¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

621493 is a deficient number, since it is larger than the sum of its proper divisors (7947).

621493 is an equidigital number, since it uses as much as digits as its factorization.

621493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7946.

The product of its digits is 1296, while the sum is 25.

The square root of 621493 is about 788.3482732904. The cubic root of 621493 is about 85.3385803387.

It can be divided in two parts, 621 and 493, that multiplied together give a triangular number (306153 = T₇₈₂).

The spelling of 621493 in words is "six hundred twenty-one thousand, four hundred ninety-three".