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13870139 = 67207017
BaseRepresentation
bin110100111010…
…010000111011
3222002200020212
4310322100323
512022321024
61213141335
7225615503
oct64722073
928080225
1013870139
117913928
12478a84b
132b482aa
141bb0a03
15133ea0e
hexd3a43b

13870139 has 4 divisors (see below), whose sum is σ = 14077224. Its totient is φ = 13663056.

The previous prime is 13870121. The next prime is 13870151. The reversal of 13870139 is 93107831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93107831 = 571163061.

It is a cyclic number.

It is not a de Polignac number, because 13870139 - 212 = 13866043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13870169) 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 3 ways as a sum of consecutive naturals, for example, 103442 + ... + 103575.

It is an arithmetic number, because the mean of its divisors is an integer number (3519306).

Almost surely, 213870139 is an apocalyptic number.

13870139 is a deficient number, since it is larger than the sum of its proper divisors (207085).

13870139 is an equidigital number, since it uses as much as digits as its factorization.

13870139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207084.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 13870139 is about 3724.2635513615. The cubic root of 13870139 is about 240.2667115959.

The spelling of 13870139 in words is "thirteen million, eight hundred seventy thousand, one hundred thirty-nine".

Divisors: 1 67 207017 13870139