816188401 has 8 divisors (see below), whose sum is σ = 939498560. Its totient is φ = 694556208.

The previous prime is 816188389. The next prime is 816188407. The reversal of 816188401 is 104881618.

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 816188401 - 2⁵ = 816188369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816188407) 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, 418446 + ... + 420391.

It is an arithmetic number, because the mean of its divisors is an integer number (117437320).

Almost surely, 2^816188401 is an apocalyptic number.

It is an amenable number.

816188401 is a deficient number, since it is larger than the sum of its proper divisors (123310159).

816188401 is a wasteful number, since it uses less digits than its factorization.

816188401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838983.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 816188401 is about 28569.0112009499. The cubic root of 816188401 is about 934.5376577353.

The spelling of 816188401 in words is "eight hundred sixteen million, one hundred eighty-eight thousand, four hundred one".