1684625 has 8 divisors (see below), whose sum is σ = 2102568. Its totient is φ = 1347600.

The previous prime is 1684609. The next prime is 1684667. The reversal of 1684625 is 5264861.

It can be written as a sum of positive squares in 4 ways, for example, as 23104 + 1661521 = 152^2 + 1289^2 .

It is not a de Polignac number, because 1684625 - 2⁴ = 1684609 is a prime.

It is a super-2 number, since 2×1684625² = 5675922781250, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 1684591 and 1684600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6614 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (262821).

2^1684625 is an apocalyptic number.

It is an amenable number.

1684625 is a deficient number, since it is larger than the sum of its proper divisors (417943).

1684625 is an equidigital number, since it uses as much as digits as its factorization.

1684625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13492 (or 13482 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 1684625 is about 1297.9310459343. The cubic root of 1684625 is about 118.9874289383.

The spelling of 1684625 in words is "one million, six hundred eighty-four thousand, six hundred twenty-five".