1988611393 has 4 divisors (see below), whose sum is σ = 1988700868. Its totient is φ = 1988521920.

The previous prime is 1988611379. The next prime is 1988611409. The reversal of 1988611393 is 3931168891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 988976704 + 999634689 = 31448^2 + 31617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988611393 - 2²¹ = 1986514241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988611333) 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, 17005 + ... + 65317.

It is an arithmetic number, because the mean of its divisors is an integer number (497175217).

Almost surely, 2^1988611393 is an apocalyptic number.

It is an amenable number.

1988611393 is a deficient number, since it is larger than the sum of its proper divisors (89475).

1988611393 is an equidigital number, since it uses as much as digits as its factorization.

1988611393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89474.

The product of its digits is 279936, while the sum is 49.

The square root of 1988611393 is about 44593.8492731901. The cubic root of 1988611393 is about 1257.5250386371.

The spelling of 1988611393 in words is "one billion, nine hundred eighty-eight million, six hundred eleven thousand, three hundred ninety-three".