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9990813 = 37475753
BaseRepresentation
bin100110000111…
…001010011101
3200210120211010
4212013022131
510024201223
6554045433
7150630510
oct46071235
920716733
109990813
115704278
123419879
1320ba631
141480d77
15d25393
hex98729d

9990813 has 8 divisors (see below), whose sum is σ = 15224128. Its totient is φ = 5709024.

The previous prime is 9990811. The next prime is 9990817. The reversal of 9990813 is 3180999.

9990813 is digitally balanced in base 2 and base 8, because in such bases 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 not a de Polignac number, because 9990813 - 21 = 9990811 is a prime.

It is a Duffinian number.

9990813 is strictly pandigital in base 8.

9990813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990811) 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, 237856 + ... + 237897.

It is an arithmetic number, because the mean of its divisors is an integer number (1903016).

Almost surely, 29990813 is an apocalyptic number.

It is an amenable number.

9990813 is a deficient number, since it is larger than the sum of its proper divisors (5233315).

9990813 is a wasteful number, since it uses less digits than its factorization.

9990813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475763.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 9990813 is about 3160.8247341477. The cubic root of 9990813 is about 215.3774728172.

The spelling of 9990813 in words is "nine million, nine hundred ninety thousand, eight hundred thirteen".

Divisors: 1 3 7 21 475753 1427259 3330271 9990813