188221493 has 4 divisors (see below), whose sum is σ = 189703680. Its totient is φ = 186739308.

The previous prime is 188221487. The next prime is 188221499. The reversal of 188221493 is 394122881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (188221487) and next prime (188221499).

It is a cyclic number.

It is not a de Polignac number, because 188221493 - 2¹² = 188217397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188221499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740903 + ... + 741156.

It is an arithmetic number, because the mean of its divisors is an integer number (47425920).

Almost surely, 2^188221493 is an apocalyptic number.

It is an amenable number.

188221493 is a deficient number, since it is larger than the sum of its proper divisors (1482187).

188221493 is a wasteful number, since it uses less digits than its factorization.

188221493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482186.

The product of its digits is 27648, while the sum is 38.

The square root of 188221493 is about 13719.3838418495. The cubic root of 188221493 is about 573.0903179197.

The spelling of 188221493 in words is "one hundred eighty-eight million, two hundred twenty-one thousand, four hundred ninety-three".