621436 has 12 divisors (see below), whose sum is σ = 1113112. Its totient is φ = 303408.

The previous prime is 621431. The next prime is 621443. The reversal of 621436 is 634126.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621431) by changing a digit.

621436 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a nontrivial repunit in base 85.

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, 1635 + ... + 1978.

2⁶²¹⁴³⁶ is an apocalyptic number.

It is an amenable number.

621436 is a deficient number, since it is larger than the sum of its proper divisors (491676).

621436 is a wasteful number, since it uses less digits than its factorization.

621436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660 (or 3658 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 621436 is about 788.3121209267. The cubic root of 621436 is about 85.3359713269.

The spelling of 621436 in words is "six hundred twenty-one thousand, four hundred thirty-six".