1620225 has 36 divisors (see below), whose sum is σ = 3062800. Its totient is φ = 816480.

The previous prime is 1620217. The next prime is 1620233. The reversal of 1620225 is 5220261.

It is an interprime number because it is at equal distance from previous prime (1620217) and next prime (1620233).

It is not a de Polignac number, because 1620225 - 2³ = 1620217 is a prime.

It is a Curzon number.

1620225 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1620198 and 1620207.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4086 + ... + 4464.

2^1620225 is an apocalyptic number.

1620225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620225 is a deficient number, since it is larger than the sum of its proper divisors (1442575).

1620225 is a wasteful number, since it uses less digits than its factorization.

1620225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1620225 is about 1272.8805914146. The cubic root of 1620225 is about 117.4514662995.

Adding to 1620225 its reverse (5220261), we get a palindrome (6840486).

The spelling of 1620225 in words is "one million, six hundred twenty thousand, two hundred twenty-five".