621454 has 4 divisors (see below), whose sum is σ = 932184. Its totient is φ = 310726.

The previous prime is 621451. The next prime is 621461. The reversal of 621454 is 454126.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155362 + ... + 155365.

It is an arithmetic number, because the mean of its divisors is an integer number (233046).

2⁶²¹⁴⁵⁴ is an apocalyptic number.

621454 is a deficient number, since it is larger than the sum of its proper divisors (310730).

621454 is a wasteful number, since it uses less digits than its factorization.

621454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310729.

The product of its digits is 960, while the sum is 22.

The square root of 621454 is about 788.3235376417. The cubic root of 621454 is about 85.3367952426.

The spelling of 621454 in words is "six hundred twenty-one thousand, four hundred fifty-four".