621418 has 24 divisors (see below), whose sum is σ = 1151172. Its totient is φ = 249984.

The previous prime is 621389. The next prime is 621419. The reversal of 621418 is 814126.

It can be written as a sum of positive squares in 2 ways, for example, as 603729 + 17689 = 777^2 + 133^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621419) by changing a digit.

621418 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1480 + ... + 1852.

2⁶²¹⁴¹⁸ is an apocalyptic number.

621418 is a deficient number, since it is larger than the sum of its proper divisors (529754).

621418 is a wasteful number, since it uses less digits than its factorization.

621418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 399 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 621418 is about 788.3007040464. The cubic root of 621418 is about 85.3351473952.

The spelling of 621418 in words is "six hundred twenty-one thousand, four hundred eighteen".