1685396 has 6 divisors (see below), whose sum is σ = 2949450. Its totient is φ = 842696.

The previous prime is 1685381. The next prime is 1685399. The reversal of 1685396 is 6935861.

It can be written as a sum of positive squares in only one way, i.e., 1473796 + 211600 = 1214^2 + 460^2 .

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210671 + ... + 210678.

It is an arithmetic number, because the mean of its divisors is an integer number (491575).

2^1685396 is an apocalyptic number.

It is an amenable number.

1685396 is a deficient number, since it is larger than the sum of its proper divisors (1264054).

1685396 is a wasteful number, since it uses less digits than its factorization.

1685396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421353 (or 421351 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 1685396 is about 1298.2280231146. The cubic root of 1685396 is about 119.0055784406.

The spelling of 1685396 in words is "one million, six hundred eighty-five thousand, three hundred ninety-six".