1993656 has 32 divisors (see below), whose sum is σ = 5696640. Its totient is φ = 569568.

The previous prime is 1993643. The next prime is 1993657. The reversal of 1993656 is 6563991.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5766 + ... + 6101.

It is an arithmetic number, because the mean of its divisors is an integer number (178020).

2^1993656 is an apocalyptic number.

It is an amenable number.

1993656 is an abundant number, since it is smaller than the sum of its proper divisors (3702984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1993656 is a wasteful number, since it uses less digits than its factorization.

1993656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11883 (or 11879 counting only the distinct ones).

The product of its digits is 43740, while the sum is 39.

The square root of 1993656 is about 1411.9688381831. The cubic root of 1993656 is about 125.8587482351.

The spelling of 1993656 in words is "one million, nine hundred ninety-three thousand, six hundred fifty-six".