1684631 has 4 divisors (see below), whose sum is σ = 1814232. Its totient is φ = 1555032.

The previous prime is 1684609. The next prime is 1684667. The reversal of 1684631 is 1364861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1684631 is a prime.

It is a super-2 number, since 2×1684631² = 5675963212322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1684594 and 1684603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64781 + ... + 64806.

It is an arithmetic number, because the mean of its divisors is an integer number (453558).

2^1684631 is an apocalyptic number.

1684631 is a deficient number, since it is larger than the sum of its proper divisors (129601).

1684631 is a wasteful number, since it uses less digits than its factorization.

1684631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129600.

The product of its digits is 3456, while the sum is 29.

The square root of 1684631 is about 1297.9333573031. The cubic root of 1684631 is about 118.9875702009.

The spelling of 1684631 in words is "one million, six hundred eighty-four thousand, six hundred thirty-one".