621812 has 6 divisors (see below), whose sum is σ = 1088178. Its totient is φ = 310904.

The previous prime is 621799. The next prime is 621821. The reversal of 621812 is 218126.

It can be written as a sum of positive squares in only one way, i.e., 456976 + 164836 = 676^2 + 406^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621812.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77723 + ... + 77730.

It is an arithmetic number, because the mean of its divisors is an integer number (181363).

2⁶²¹⁸¹² is an apocalyptic number.

It is an amenable number.

621812 is a deficient number, since it is larger than the sum of its proper divisors (466366).

621812 is a wasteful number, since it uses less digits than its factorization.

621812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155457 (or 155455 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 621812 is about 788.5505690823. The cubic root of 621812 is about 85.3531787068.

Adding to 621812 its reverse (218126), we get a palindrome (839938).

The spelling of 621812 in words is "six hundred twenty-one thousand, eight hundred twelve".