625421 has 4 divisors (see below), whose sum is σ = 627744. Its totient is φ = 623100.

The previous prime is 625409. The next prime is 625451. The reversal of 625421 is 124526.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 625421 - 2¹⁸ = 363277 is a prime.

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 = 625393 and 625402.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 625421.

It is not an unprimeable number, because it can be changed into a prime (625451) 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, 695 + ... + 1316.

It is an arithmetic number, because the mean of its divisors is an integer number (156936).

2⁶²⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

625421 is a deficient number, since it is larger than the sum of its proper divisors (2323).

625421 is a wasteful number, since it uses less digits than its factorization.

625421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322.

The product of its digits is 480, while the sum is 20.

The square root of 625421 is about 790.8356339974. The cubic root of 625421 is about 85.5179903550.

Adding to 625421 its reverse (124526), we get a palindrome (749947).

The spelling of 625421 in words is "six hundred twenty-five thousand, four hundred twenty-one".