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13679381 = 37457809
BaseRepresentation
bin110100001011…
…101100010101
3221201222120202
4310023230111
512000220011
61205110245
7224162402
oct64135425
927658522
1013679381
1177a3581
1246b8385
132aac511
141b612a9
15130323b
hexd0bb15

13679381 has 8 divisors (see below), whose sum is σ = 14097240. Its totient is φ = 13264128.

The previous prime is 13679333. The next prime is 13679383. The reversal of 13679381 is 18397631.

13679381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10182481 + 3496900 = 3191^2 + 1870^2 .

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 13679381 - 218 = 13417237 is a prime.

It is a super-2 number, since 2×136793812 = 374250929086322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13679383) 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, 16505 + ... + 17313.

It is an arithmetic number, because the mean of its divisors is an integer number (1762155).

Almost surely, 213679381 is an apocalyptic number.

It is an amenable number.

13679381 is a deficient number, since it is larger than the sum of its proper divisors (417859).

13679381 is an equidigital number, since it uses as much as digits as its factorization.

13679381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303.

The product of its digits is 27216, while the sum is 38.

The square root of 13679381 is about 3698.5647216184. The cubic root of 13679381 is about 239.1601489616.

The spelling of 13679381 in words is "thirteen million, six hundred seventy-nine thousand, three hundred eighty-one".

Divisors: 1 37 457 809 16909 29933 369713 13679381