1688742 has 32 divisors (see below), whose sum is σ = 4095360. Its totient is φ = 511560.

The previous prime is 1688741. The next prime is 1688759. The reversal of 1688742 is 2478861.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1688697 and 1688706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 828 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (127980).

2^1688742 is an apocalyptic number.

1688742 is an abundant number, since it is smaller than the sum of its proper divisors (2406618).

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

1688742 is a wasteful number, since it uses less digits than its factorization.

1688742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865 (or 2859 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1688742 is about 1299.5160637714. The cubic root of 1688742 is about 119.0842799142.

The spelling of 1688742 in words is "one million, six hundred eighty-eight thousand, seven hundred forty-two".