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520405139 = 1730612067
BaseRepresentation
bin11111000001001…
…100000010010011
31100021020022122102
4133001030002103
52031210431024
6123350031015
715616241102
oct3701140223
91307208572
10520405139
112478340a1
1212634846b
1383a7aa47
144d188039
1530a491ae
hex1f04c093

520405139 has 4 divisors (see below), whose sum is σ = 551017224. Its totient is φ = 489793056.

The previous prime is 520405133. The next prime is 520405141. The reversal of 520405139 is 931504025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520405139 - 28 = 520404883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520405133) 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, 15306017 + ... + 15306050.

It is an arithmetic number, because the mean of its divisors is an integer number (137754306).

Almost surely, 2520405139 is an apocalyptic number.

520405139 is a deficient number, since it is larger than the sum of its proper divisors (30612085).

520405139 is a wasteful number, since it uses less digits than its factorization.

520405139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30612084.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 520405139 is about 22812.3900326117. The cubic root of 520405139 is about 804.3539376088.

The spelling of 520405139 in words is "five hundred twenty million, four hundred five thousand, one hundred thirty-nine".

Divisors: 1 17 30612067 520405139