1690634 has 8 divisors (see below), whose sum is σ = 2766528. Its totient is φ = 768460.

The previous prime is 1690621. The next prime is 1690651. The reversal of 1690634 is 4360961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1690597 and 1690606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38402 + ... + 38445.

It is an arithmetic number, because the mean of its divisors is an integer number (345816).

2^1690634 is an apocalyptic number.

1690634 is a deficient number, since it is larger than the sum of its proper divisors (1075894).

1690634 is a wasteful number, since it uses less digits than its factorization.

1690634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76860.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1690634 is about 1300.2438232885. The cubic root of 1690634 is about 119.1287357612.

The spelling of 1690634 in words is "one million, six hundred ninety thousand, six hundred thirty-four".