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12381979 = 431991447
BaseRepresentation
bin101111001110…
…111100011011
3212022001212211
4233032330123
511132210404
61121215551
7210150031
oct57167433
925261784
1012381979
116a97845
1241915b7
132746b1c
141904551
151148b04
hexbcef1b

12381979 has 8 divisors (see below), whose sum is σ = 12742400. Its totient is φ = 12024936.

The previous prime is 12381973. The next prime is 12381983. The reversal of 12381979 is 97918321.

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 12381979 - 27 = 12381851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12381973) 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, 7834 + ... + 9280.

It is an arithmetic number, because the mean of its divisors is an integer number (1592800).

Almost surely, 212381979 is an apocalyptic number.

12381979 is a deficient number, since it is larger than the sum of its proper divisors (360421).

12381979 is a wasteful number, since it uses less digits than its factorization.

12381979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689.

The product of its digits is 27216, while the sum is 40.

The square root of 12381979 is about 3518.8036319181. The cubic root of 12381979 is about 231.3467241836.

The spelling of 12381979 in words is "twelve million, three hundred eighty-one thousand, nine hundred seventy-nine".

Divisors: 1 43 199 1447 8557 62221 287953 12381979