621490 has 16 divisors (see below), whose sum is σ = 1177920. Its totient is φ = 235440.

The previous prime is 621473. The next prime is 621521. The reversal of 621490 is 94126.

It is an unprimeable number.

621490 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1446 + ... + 1825.

It is an arithmetic number, because the mean of its divisors is an integer number (73620).

2⁶²¹⁴⁹⁰ is an apocalyptic number.

621490 is a deficient number, since it is larger than the sum of its proper divisors (556430).

621490 is a wasteful number, since it uses less digits than its factorization.

621490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 621490 is about 788.3463705758. The cubic root of 621490 is about 85.3384430263.

It can be divided in two parts, 621 and 490, that added together give a palindrome (1111).

The spelling of 621490 in words is "six hundred twenty-one thousand, four hundred ninety".