621198 has 12 divisors (see below), whose sum is σ = 1345968. Its totient is φ = 207060.

The previous prime is 621143. The next prime is 621217. The reversal of 621198 is 891126.

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 621198.

It is an unprimeable 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 5 ways as a sum of consecutive naturals, for example, 17238 + ... + 17273.

It is an arithmetic number, because the mean of its divisors is an integer number (112164).

2⁶²¹¹⁹⁸ is an apocalyptic number.

621198 is an abundant number, since it is smaller than the sum of its proper divisors (724770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621198 is a wasteful number, since it uses less digits than its factorization.

621198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34519 (or 34516 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 621198 is about 788.1611510345. The cubic root of 621198 is about 85.3250758340.

The spelling of 621198 in words is "six hundred twenty-one thousand, one hundred ninety-eight".