621434 has 16 divisors (see below), whose sum is σ = 1040256. Its totient is φ = 276000.

The previous prime is 621431. The next prime is 621443. The reversal of 621434 is 434126.

It is a happy number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621434.

It is not an unprimeable number, because it can be changed into a prime (621431) 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 7 ways as a sum of consecutive naturals, for example, 734 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (65016).

2⁶²¹⁴³⁴ is an apocalyptic number.

621434 is a deficient number, since it is larger than the sum of its proper divisors (418822).

621434 is a wasteful number, since it uses less digits than its factorization.

621434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its digits is 576, while the sum is 20.

The square root of 621434 is about 788.3108523926. The cubic root of 621434 is about 85.3358797797.

The spelling of 621434 in words is "six hundred twenty-one thousand, four hundred thirty-four".