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12145405 = 56139821
BaseRepresentation
bin101110010101…
…001011111101
3211212001100211
4232111023331
511102123110
61112152421
7205143226
oct56251375
924761324
1012145405
116946028
124098711
13269323c
14188224d
1510ed98a
hexb952fd

12145405 has 8 divisors (see below), whose sum is σ = 14813784. Its totient is φ = 9556800.

The previous prime is 12145387. The next prime is 12145417. The reversal of 12145405 is 50454121.

It can be written as a sum of positive squares in 4 ways, for example, as 125316 + 12020089 = 354^2 + 3467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12145405 - 25 = 12145373 is a prime.

It is a super-2 number, since 2×121454052 = 295021725228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19606 + ... + 20215.

It is an arithmetic number, because the mean of its divisors is an integer number (1851723).

Almost surely, 212145405 is an apocalyptic number.

It is an amenable number.

12145405 is a deficient number, since it is larger than the sum of its proper divisors (2668379).

12145405 is an equidigital number, since it uses as much as digits as its factorization.

12145405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39887.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 12145405 is about 3485.0258248684. The cubic root of 12145405 is about 229.8638450610.

Adding to 12145405 its reverse (50454121), we get a palindrome (62599526).

The spelling of 12145405 in words is "twelve million, one hundred forty-five thousand, four hundred five".

Divisors: 1 5 61 305 39821 199105 2429081 12145405