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99399721 = 238352069
BaseRepresentation
bin1011110110010…
…11100000101001
320221001000210011
411323023200221
5200421242341
613510251521
72314612051
oct573134051
9227030704
1099399721
1151121533
1229356ba1
1317793505
14d2b6561
158ad6b81
hex5ecb829

99399721 has 8 divisors (see below), whose sum is σ = 104973120. Its totient is φ = 93930672.

The previous prime is 99399709. The next prime is 99399743. The reversal of 99399721 is 12799399.

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 99399721 - 213 = 99391529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99399701) 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, 24126 + ... + 27943.

It is an arithmetic number, because the mean of its divisors is an integer number (13121640).

Almost surely, 299399721 is an apocalyptic number.

It is an amenable number.

99399721 is a deficient number, since it is larger than the sum of its proper divisors (5573399).

99399721 is a wasteful number, since it uses less digits than its factorization.

99399721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52175.

The product of its digits is 275562, while the sum is 49.

The square root of 99399721 is about 9969.9408724425. The cubic root of 99399721 is about 463.2282693419.

The spelling of 99399721 in words is "ninety-nine million, three hundred ninety-nine thousand, seven hundred twenty-one".

Divisors: 1 23 83 1909 52069 1197587 4321727 99399721