621457 has 4 divisors (see below), whose sum is σ = 641536. Its totient is φ = 601380.

The previous prime is 621451. The next prime is 621461. The reversal of 621457 is 754126.

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.

It is a cyclic number.

It is not a de Polignac number, because 621457 - 2¹⁹ = 97169 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (621451) 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, 9993 + ... + 10054.

It is an arithmetic number, because the mean of its divisors is an integer number (160384).

2⁶²¹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

621457 is a deficient number, since it is larger than the sum of its proper divisors (20079).

621457 is a wasteful number, since it uses less digits than its factorization.

621457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20078.

The product of its digits is 1680, while the sum is 25.

The square root of 621457 is about 788.3254404115. The cubic root of 621457 is about 85.3369325603.

The spelling of 621457 in words is "six hundred twenty-one thousand, four hundred fifty-seven".