621172 has 12 divisors (see below), whose sum is σ = 1100736. Its totient is φ = 306680.

The previous prime is 621143. The next prime is 621217. The reversal of 621172 is 271126.

It is a congruent number.

It is an unprimeable number.

621172 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604 + ... + 1267.

It is an arithmetic number, because the mean of its divisors is an integer number (91728).

2⁶²¹¹⁷² is an apocalyptic number.

It is an amenable number.

621172 is a deficient number, since it is larger than the sum of its proper divisors (479564).

621172 is a wasteful number, since it uses less digits than its factorization.

621172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958 (or 1956 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The square root of 621172 is about 788.1446567731. The cubic root of 621172 is about 85.3238854015.

Adding to 621172 its reverse (271126), we get a palindrome (892298).

The spelling of 621172 in words is "six hundred twenty-one thousand, one hundred seventy-two".