188890421 has 8 divisors (see below), whose sum is σ = 197969280. Its totient is φ = 179883792.

The previous prime is 188890411. The next prime is 188890423. The reversal of 188890421 is 124098881.

188890421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188890421 is a prime.

It is a super-2 number, since 2×188890421² = 71359182291114482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188890423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12665 + ... + 23198.

It is an arithmetic number, because the mean of its divisors is an integer number (24746160).

Almost surely, 2^188890421 is an apocalyptic number.

It is an amenable number.

188890421 is a deficient number, since it is larger than the sum of its proper divisors (9078859).

188890421 is a wasteful number, since it uses less digits than its factorization.

188890421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36115.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 188890421 is about 13743.7411573414. The cubic root of 188890421 is about 573.7684248794.

The spelling of 188890421 in words is "one hundred eighty-eight million, eight hundred ninety thousand, four hundred twenty-one".