620444121 has 16 divisors (see below), whose sum is σ = 955551168. Its totient is φ = 353907200.

The previous prime is 620444081. The next prime is 620444141. The reversal of 620444121 is 121444026.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 620444121 - 2⁶ = 620444057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 620444091 and 620444100.

It is not an unprimeable number, because it can be changed into a prime (620444141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552420 + ... + 553541.

It is an arithmetic number, because the mean of its divisors is an integer number (59721948).

Almost surely, 2^620444121 is an apocalyptic number.

It is an amenable number.

620444121 is a deficient number, since it is larger than the sum of its proper divisors (335107047).

620444121 is a wasteful number, since it uses less digits than its factorization.

620444121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105992.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 620444121 is about 24908.7157637643. The cubic root of 620444121 is about 852.9054533986.

Adding to 620444121 its reverse (121444026), we get a palindrome (741888147).

The spelling of 620444121 in words is "six hundred twenty million, four hundred forty-four thousand, one hundred twenty-one".