1685972 has 6 divisors (see below), whose sum is σ = 2950458. Its totient is φ = 842984.

The previous prime is 1685963. The next prime is 1685977. The reversal of 1685972 is 2795861.

It can be written as a sum of positive squares in only one way, i.e., 1522756 + 163216 = 1234^2 + 404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210743 + ... + 210750.

It is an arithmetic number, because the mean of its divisors is an integer number (491743).

2^1685972 is an apocalyptic number.

It is an amenable number.

1685972 is a deficient number, since it is larger than the sum of its proper divisors (1264486).

1685972 is a wasteful number, since it uses less digits than its factorization.

1685972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421497 (or 421495 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 1685972 is about 1298.4498450075. The cubic root of 1685972 is about 119.0191339899.

The spelling of 1685972 in words is "one million, six hundred eighty-five thousand, nine hundred seventy-two".