1630625 has 10 divisors (see below), whose sum is σ = 2038410. Its totient is φ = 1304000.

The previous prime is 1630621. The next prime is 1630633. The reversal of 1630625 is 5260361.

It can be written as a sum of positive squares in 5 ways, for example, as 654481 + 976144 = 809^2 + 988^2 .

It is not a de Polignac number, because 1630625 - 2² = 1630621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1630625.

It is not an unprimeable number, because it can be changed into a prime (1630621) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 680 + ... + 1929.

It is an arithmetic number, because the mean of its divisors is an integer number (203841).

2^1630625 is an apocalyptic number.

It is an amenable number.

1630625 is a deficient number, since it is larger than the sum of its proper divisors (407785).

1630625 is an frugal number, since it uses more digits than its factorization.

1630625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629 (or 2614 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1630625 is about 1276.9592789122. The cubic root of 1630625 is about 117.7022320869.

Adding to 1630625 its reverse (5260361), we get a palindrome (6890986).

It can be divided in two parts, 16 and 30625, that multiplied together give a square (490000 = 700²).

The spelling of 1630625 in words is "one million, six hundred thirty thousand, six hundred twenty-five".