1688949 has 6 divisors (see below), whose sum is σ = 2439606. Its totient is φ = 1125960.

The previous prime is 1688927. The next prime is 1688969. The reversal of 1688949 is 9498861.

It can be written as a sum of positive squares in only one way, i.e., 1580049 + 108900 = 1257^2 + 330^2 .

It is not a de Polignac number, because 1688949 - 2⁵ = 1688917 is a prime.

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 (1688909) 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, 93822 + ... + 93839.

It is an arithmetic number, because the mean of its divisors is an integer number (406601).

2^1688949 is an apocalyptic number.

It is an amenable number.

1688949 is a deficient number, since it is larger than the sum of its proper divisors (750657).

1688949 is a wasteful number, since it uses less digits than its factorization.

1688949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187667 (or 187664 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1688949 is about 1299.5957063641. The cubic root of 1688949 is about 119.0891453581.

The spelling of 1688949 in words is "one million, six hundred eighty-eight thousand, nine hundred forty-nine".