621698 has 24 divisors (see below), whose sum is σ = 1174656. Its totient is φ = 241560.

The previous prime is 621697. The next prime is 621701. The reversal of 621698 is 896126.

Added to its reverse (896126) it gives a square (1517824 = 1232²).

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 621698.

It is not an unprimeable number, because it can be changed into a prime (621697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1511 + ... + 1877.

It is an arithmetic number, because the mean of its divisors is an integer number (48944).

2⁶²¹⁶⁹⁸ is an apocalyptic number.

621698 is a deficient number, since it is larger than the sum of its proper divisors (552958).

621698 is a wasteful number, since it uses less digits than its factorization.

621698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 387 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 621698 is about 788.4782812481. The cubic root of 621698 is about 85.3479623086.

Adding to 621698 its reverse (896126), we get a square (1517824 = 1232²).

The spelling of 621698 in words is "six hundred twenty-one thousand, six hundred ninety-eight".