1690725 has 12 divisors (see below), whose sum is σ = 2795456. Its totient is φ = 901680.

The previous prime is 1690693. The next prime is 1690727. The reversal of 1690725 is 5270961.

It is not a de Polignac number, because 1690725 - 2⁵ = 1690693 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1690692 and 1690701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11197 + ... + 11346.

2^1690725 is an apocalyptic number.

1690725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1690725 is a deficient number, since it is larger than the sum of its proper divisors (1104731).

1690725 is a wasteful number, since it uses less digits than its factorization.

1690725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22556 (or 22551 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 1690725 is about 1300.2788162544. The cubic root of 1690725 is about 119.1308731291.

It can be divided in two parts, 1690 and 725, that added together give a triangular number (2415 = T₆₉).

The spelling of 1690725 in words is "one million, six hundred ninety thousand, seven hundred twenty-five".