1993406840844 has 48 divisors (see below), whose sum is σ = 4940929623168. Its totient is φ = 623345442048.

The previous prime is 1993406840837. The next prime is 1993406840869. The reversal of 1993406840844 is 4480486043991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15852034 + ... + 15977289.

It is an arithmetic number, because the mean of its divisors is an integer number (102936033816).

Almost surely, 2^{1993406840844} is an apocalyptic number.

It is an amenable number.

1993406840844 is an abundant number, since it is smaller than the sum of its proper divisors (2947522782324).

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

1993406840844 is a wasteful number, since it uses less digits than its factorization.

1993406840844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31829654 (or 31829652 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 60.

The spelling of 1993406840844 in words is "one trillion, nine hundred ninety-three billion, four hundred six million, eight hundred forty thousand, eight hundred forty-four".