621400 has 48 divisors (see below), whose sum is σ = 1562400. Its totient is φ = 228480.

The previous prime is 621389. The next prime is 621419. The reversal of 621400 is 4126.

It is a super-2 number, since 2×621400² = 772275920000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 2481 + ... + 2719.

It is an arithmetic number, because the mean of its divisors is an integer number (32550).

2⁶²¹⁴⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781200).

621400 is an abundant number, since it is smaller than the sum of its proper divisors (941000).

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

621400 is a wasteful number, since it uses less digits than its factorization.

621400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 621400 is about 788.2892870007. The cubic root of 621400 is about 85.3343234477.

Adding to 621400 its reverse (4126), we get a palindrome (625526).

The spelling of 621400 in words is "six hundred twenty-one thousand, four hundred".