621694 has 8 divisors (see below), whose sum is σ = 954360. Its totient is φ = 303576.

The previous prime is 621679. The next prime is 621697. The reversal of 621694 is 496126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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

621694 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 3529 + ... + 3700.

It is an arithmetic number, because the mean of its divisors is an integer number (119295).

2⁶²¹⁶⁹⁴ is an apocalyptic number.

621694 is a deficient number, since it is larger than the sum of its proper divisors (332666).

621694 is a wasteful number, since it uses less digits than its factorization.

621694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7274.

The product of its digits is 2592, while the sum is 28.

The square root of 621694 is about 788.4757447125. The cubic root of 621694 is about 85.3477792655.

The spelling of 621694 in words is "six hundred twenty-one thousand, six hundred ninety-four".