621417 has 4 divisors (see below), whose sum is σ = 828560. Its totient is φ = 414276.

The previous prime is 621389. The next prime is 621419. The reversal of 621417 is 714126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 621417 - 2⁶ = 621353 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 621393 and 621402.

It is not an unprimeable number, because it can be changed into a prime (621419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103567 + ... + 103572.

It is an arithmetic number, because the mean of its divisors is an integer number (207140).

2⁶²¹⁴¹⁷ is an apocalyptic number.

It is an amenable number.

621417 is a deficient number, since it is larger than the sum of its proper divisors (207143).

621417 is a wasteful number, since it uses less digits than its factorization.

621417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207142.

The product of its digits is 336, while the sum is 21.

The square root of 621417 is about 788.3000697704. The cubic root of 621417 is about 85.3351016208.

The spelling of 621417 in words is "six hundred twenty-one thousand, four hundred seventeen".