621398 has 8 divisors (see below), whose sum is σ = 942840. Its totient is φ = 307120.

The previous prime is 621389. The next prime is 621419. The reversal of 621398 is 893126.

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

It is a super-2 number, since 2×621398² = 772270948808, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 621398.

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 621398.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (117855).

2⁶²¹³⁹⁸ is an apocalyptic number.

621398 is a deficient number, since it is larger than the sum of its proper divisors (321442).

621398 is a wasteful number, since it uses less digits than its factorization.

621398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582.

The product of its digits is 2592, while the sum is 29.

The square root of 621398 is about 788.2880184298. The cubic root of 621398 is about 85.3342318970.

The spelling of 621398 in words is "six hundred twenty-one thousand, three hundred ninety-eight".