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21474379 = 611971787
BaseRepresentation
bin101000111101…
…0110001001011
31111102000022101
41101322301023
520444140004
62044134231
7350346343
oct121726113
944360271
1021474379
1111138023
127237377
1345ab544
142bcdd23
151d42ba4
hex147ac4b

21474379 has 8 divisors (see below), whose sum is σ = 21949488. Its totient is φ = 21003360.

The previous prime is 21474377. The next prime is 21474391. The reversal of 21474379 is 97347412.

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 21474379 - 21 = 21474377 is a prime.

It is a super-2 number, since 2×214743792 = 922297906871282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21474377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11124 + ... + 12910.

It is an arithmetic number, because the mean of its divisors is an integer number (2743686).

Almost surely, 221474379 is an apocalyptic number.

21474379 is a deficient number, since it is larger than the sum of its proper divisors (475109).

21474379 is a wasteful number, since it uses less digits than its factorization.

21474379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045.

The product of its digits is 42336, while the sum is 37.

The square root of 21474379 is about 4634.0456406902. The cubic root of 21474379 is about 277.9543901504.

The spelling of 21474379 in words is "twenty-one million, four hundred seventy-four thousand, three hundred seventy-nine".

Divisors: 1 61 197 1787 12017 109007 352039 21474379