1690636 has 12 divisors (see below), whose sum is σ = 2977912. Its totient is φ = 839808.

The previous prime is 1690621. The next prime is 1690651. The reversal of 1690636 is 6360961.

It is an interprime number because it is at equal distance from previous prime (1690621) and next prime (1690651).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 11.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1690598 and 1690607.

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, 645 + ... + 1948.

2^1690636 is an apocalyptic number.

It is an amenable number.

1690636 is a deficient number, since it is larger than the sum of its proper divisors (1287276).

1690636 is a wasteful number, since it uses less digits than its factorization.

1690636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760 (or 2758 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 1690636 is about 1300.2445923748. The cubic root of 1690636 is about 119.1287827371.

Subtracting from 1690636 its product of nonzero digits (5832), we obtain a square (1684804 = 1298²).

The spelling of 1690636 in words is "one million, six hundred ninety thousand, six hundred thirty-six".