99788401 has 4 divisors (see below), whose sum is σ = 100060672. Its totient is φ = 99516132.

The previous prime is 99788363. The next prime is 99788407. The reversal of 99788401 is 10488799.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10488799 = 103 ⋅101833.

It is a cyclic number.

It is not a de Polignac number, because 99788401 - 2¹³ = 99780209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99788407) 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, 135585 + ... + 136318.

It is an arithmetic number, because the mean of its divisors is an integer number (25015168).

Almost surely, 2^99788401 is an apocalyptic number.

It is an amenable number.

99788401 is a deficient number, since it is larger than the sum of its proper divisors (272271).

99788401 is a wasteful number, since it uses less digits than its factorization.

99788401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272270.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 99788401 is about 9989.4144473037. The cubic root of 99788401 is about 463.8312669896.

It can be divided in two parts, 997 and 88401, that added together give a palindrome (89398).

The spelling of 99788401 in words is "ninety-nine million, seven hundred eighty-eight thousand, four hundred one".