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21988794 = 233664799
BaseRepresentation
bin101001111100…
…0010110111010
31112101010221210
41103320112322
521112120134
62103143550
7354621162
oct123702672
945333853
1021988794
1111459563
127444bb6
13472b729
142cc55a2
151de52e9
hex14f85ba

21988794 has 8 divisors (see below), whose sum is σ = 43977600. Its totient is φ = 7329596.

The previous prime is 21988793. The next prime is 21988801. The reversal of 21988794 is 49788912.

It is a sphenic number, since it is the product of 3 distinct primes.

21988794 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21988793) 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, 1832394 + ... + 1832405.

It is an arithmetic number, because the mean of its divisors is an integer number (5497200).

Almost surely, 221988794 is an apocalyptic number.

21988794 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21988794 is a wasteful number, since it uses less digits than its factorization.

21988794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664804.

The product of its digits is 290304, while the sum is 48.

The square root of 21988794 is about 4689.2210440541. The cubic root of 21988794 is about 280.1563497541.

The spelling of 21988794 in words is "twenty-one million, nine hundred eighty-eight thousand, seven hundred ninety-four".

Divisors: 1 2 3 6 3664799 7329598 10994397 21988794