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21738442 = 211988111
BaseRepresentation
bin101001011101…
…1001111001010
31111220102112111
41102323033022
521031112232
62053532534
7352526245
oct122731712
944812474
1021738442
11112a8460
12734414a
1346717ab
142c5c25c
151d96047
hex14bb3ca

21738442 has 8 divisors (see below), whose sum is σ = 35572032. Its totient is φ = 9881100.

The previous prime is 21738419. The next prime is 21738443. The reversal of 21738442 is 24483712.

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

It is not an unprimeable number, because it can be changed into a prime (21738443) 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, 494034 + ... + 494077.

It is an arithmetic number, because the mean of its divisors is an integer number (4446504).

Almost surely, 221738442 is an apocalyptic number.

21738442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21738442 is a deficient number, since it is larger than the sum of its proper divisors (13833590).

21738442 is a wasteful number, since it uses less digits than its factorization.

21738442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988124.

The product of its digits is 10752, while the sum is 31.

The square root of 21738442 is about 4662.4502142114. The cubic root of 21738442 is about 279.0890548736.

The spelling of 21738442 in words is "twenty-one million, seven hundred thirty-eight thousand, four hundred forty-two".

Divisors: 1 2 11 22 988111 1976222 10869221 21738442