1686942 has 12 divisors (see below), whose sum is σ = 3655080. Its totient is φ = 562308.

The previous prime is 1686931. The next prime is 1686943. The reversal of 1686942 is 2496861.

It is a super-2 number, since 2×1686942² = 5691546622728, which contains 22 as substring.

It is a d-powerful number, because it can be written as 1 + 6³ + 8³ + 6⁸ + 9⁴ + 4 + 2⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 1686897 and 1686906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46842 + ... + 46877.

It is an arithmetic number, because the mean of its divisors is an integer number (304590).

2^1686942 is an apocalyptic number.

1686942 is an abundant number, since it is smaller than the sum of its proper divisors (1968138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686942 is a wasteful number, since it uses less digits than its factorization.

1686942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93727 (or 93724 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1686942 is about 1298.8233136189. The cubic root of 1686942 is about 119.0419549356.

It can be divided in two parts, 1686 and 942, that added together give a triangular number (2628 = T₇₂).

The spelling of 1686942 in words is "one million, six hundred eighty-six thousand, nine hundred forty-two".