1639996 has 6 divisors (see below), whose sum is σ = 2870000. Its totient is φ = 819996.

The previous prime is 1639991. The next prime is 1639999. The reversal of 1639996 is 6999361.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204996 + ... + 205003.

2^1639996 is an apocalyptic number.

It is an amenable number.

1639996 is a deficient number, since it is larger than the sum of its proper divisors (1230004).

1639996 is a wasteful number, since it uses less digits than its factorization.

1639996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410003 (or 410001 counting only the distinct ones).

The product of its digits is 78732, while the sum is 43.

The square root of 1639996 is about 1280.6232857480. The cubic root of 1639996 is about 117.9272749234.

It can be divided in two parts, 16 and 39996, that multiplied together give a palindrome (639936).

The spelling of 1639996 in words is "one million, six hundred thirty-nine thousand, nine hundred ninety-six".