621026 has 12 divisors (see below), whose sum is σ = 1083798. Its totient is φ = 266112.

The previous prime is 621017. The next prime is 621029. The reversal of 621026 is 620126.

It can be written as a sum of positive squares in only one way, i.e., 561001 + 60025 = 749^2 + 245^2 .

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 620995 and 621013.

It is not an unprimeable number, because it can be changed into a prime (621029) by changing a digit.

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, 3071 + ... + 3266.

2⁶²¹⁰²⁶ is an apocalyptic number.

621026 is a deficient number, since it is larger than the sum of its proper divisors (462772).

621026 is a wasteful number, since it uses less digits than its factorization.

621026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6353 (or 6346 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 621026 is about 788.0520287392. The cubic root of 621026 is about 85.3172000479.

Subtracting from 621026 its reverse (620126), we obtain a square (900 = 30²).

The spelling of 621026 in words is "six hundred twenty-one thousand, twenty-six".