1655625 has 20 divisors (see below), whose sum is σ = 2761616. Its totient is φ = 882000.

The previous prime is 1655623. The next prime is 1655627. The reversal of 1655625 is 5265561.

It is an interprime number because it is at equal distance from previous prime (1655623) and next prime (1655627).

It is not a de Polignac number, because 1655625 - 2¹ = 1655623 is a prime.

It is a Duffinian number.

It is a Curzon number.

1655625 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1655592 and 1655601.

It is not an unprimeable number, because it can be changed into a prime (1655623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1434 + ... + 2316.

2^1655625 is an apocalyptic number.

1655625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1655625 is a deficient number, since it is larger than the sum of its proper divisors (1105991).

1655625 is an frugal number, since it uses more digits than its factorization.

1655625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 891 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 1655625 is about 1286.7109232458. The cubic root of 1655625 is about 118.3007029429.

The spelling of 1655625 in words is "one million, six hundred fifty-five thousand, six hundred twenty-five".