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9978642 = 2322324103
BaseRepresentation
bin100110000100…
…001100010010
3200202222010100
4212010030102
510023304032
6553513230
7150550152
oct46041422
920688110
109978642
1156a6113
123412816
1320b4c2b
14147a762
15d2197c
hex984312

9978642 has 24 divisors (see below), whose sum is σ = 22561344. Its totient is φ = 3181464.

The previous prime is 9978637. The next prime is 9978649. The reversal of 9978642 is 2468799.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9978649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11638 + ... + 12465.

It is an arithmetic number, because the mean of its divisors is an integer number (940056).

Almost surely, 29978642 is an apocalyptic number.

9978642 is an abundant number, since it is smaller than the sum of its proper divisors (12582702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9978642 is a wasteful number, since it uses less digits than its factorization.

9978642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24134 (or 24131 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 9978642 is about 3158.8988587797. The cubic root of 9978642 is about 215.2899782891.

The spelling of 9978642 in words is "nine million, nine hundred seventy-eight thousand, six hundred forty-two".

Divisors: 1 2 3 6 9 18 23 46 69 138 207 414 24103 48206 72309 144618 216927 433854 554369 1108738 1663107 3326214 4989321 9978642