993640 has 16 divisors (see below), whose sum is σ = 2235780. Its totient is φ = 397440.

The previous prime is 993617. The next prime is 993647. The reversal of 993640 is 46399.

993640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 887364 + 106276 = 942^2 + 326^2 .

It is not an unprimeable number, because it can be changed into a prime (993647) by changing a digit.

993640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12381 + ... + 12460.

2⁹⁹³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

993640 is an abundant number, since it is smaller than the sum of its proper divisors (1242140).

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

993640 is a wasteful number, since it uses less digits than its factorization.

993640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24852 (or 24848 counting only the distinct ones).

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

The square root of 993640 is about 996.8149276571. The cubic root of 993640 is about 99.7875489652.

The spelling of 993640 in words is "nine hundred ninety-three thousand, six hundred forty".