621458 has 4 divisors (see below), whose sum is σ = 932190. Its totient is φ = 310728.

The previous prime is 621451. The next prime is 621461. The reversal of 621458 is 854126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 368449 + 253009 = 607^2 + 503^2 .

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (621451) by changing a digit.

621458 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 155363 + ... + 155366.

2⁶²¹⁴⁵⁸ is an apocalyptic number.

621458 is a deficient number, since it is larger than the sum of its proper divisors (310732).

621458 is a wasteful number, since it uses less digits than its factorization.

621458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310731.

The product of its digits is 1920, while the sum is 26.

The square root of 621458 is about 788.3260746671. The cubic root of 621458 is about 85.3369783328.

The spelling of 621458 in words is "six hundred twenty-one thousand, four hundred fifty-eight".