188790401 has 8 divisors (see below), whose sum is σ = 190153224. Its totient is φ = 187432960.

The previous prime is 188790397. The next prime is 188790443. The reversal of 188790401 is 104097881.

It can be written as a sum of positive squares in 4 ways, for example, as 62789776 + 126000625 = 7924^2 + 11225^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 188790401 - 2² = 188790397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188790101) 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 7 ways as a sum of consecutive naturals, for example, 89681 + ... + 91761.

It is an arithmetic number, because the mean of its divisors is an integer number (23769153).

Almost surely, 2^188790401 is an apocalyptic number.

It is an amenable number.

188790401 is a deficient number, since it is larger than the sum of its proper divisors (1362823).

188790401 is a wasteful number, since it uses less digits than its factorization.

188790401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 188790401 is about 13740.1019282973. The cubic root of 188790401 is about 573.6671343184.

The spelling of 188790401 in words is "one hundred eighty-eight million, seven hundred ninety thousand, four hundred one".