1687373 has 2 divisors, whose sum is σ = 1687374. Its totient is φ = 1687372.

The previous prime is 1687339. The next prime is 1687381. The reversal of 1687373 is 3737861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1630729 + 56644 = 1277^2 + 238^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687373 - 2⁸ = 1687117 is a prime.

It is a super-2 number, since 2×1687373² = 5694455282258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843686 + 843687.

It is an arithmetic number, because the mean of its divisors is an integer number (843687).

2^1687373 is an apocalyptic number.

It is an amenable number.

1687373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687373 is an equidigital number, since it uses as much as digits as its factorization.

1687373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 1687373 is about 1298.9892224341. The cubic root of 1687373 is about 119.0520921570.

The spelling of 1687373 in words is "one million, six hundred eighty-seven thousand, three hundred seventy-three".