1649638 has 8 divisors (see below), whose sum is σ = 2482632. Its totient is φ = 822096.

The previous prime is 1649621. The next prime is 1649639. The reversal of 1649638 is 8369461.

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

It is a junction number, because it is equal to n+sod(n) for n = 1649597 and 1649606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649639) 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, 495 + ... + 1882.

It is an arithmetic number, because the mean of its divisors is an integer number (310329).

2^1649638 is an apocalyptic number.

1649638 is a deficient number, since it is larger than the sum of its proper divisors (832994).

1649638 is a wasteful number, since it uses less digits than its factorization.

1649638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726.

The product of its digits is 31104, while the sum is 37.

The square root of 1649638 is about 1284.3823418282. The cubic root of 1649638 is about 118.1579327379.

The spelling of 1649638 in words is "one million, six hundred forty-nine thousand, six hundred thirty-eight".