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4025905 = 513241257
BaseRepresentation
bin1111010110111000110001
321120112111121
433112320301
52012312110
6222142241
746135222
oct17267061
97515447
104025905
1122aa7a4
121421981
13aac5c0
1476b249
15547cda
hex3d6e31

4025905 has 16 divisors (see below), whose sum is σ = 5244624. Its totient is φ = 2949120.

The previous prime is 4025899. The next prime is 4025909. The reversal of 4025905 is 5095204.

It can be written as a sum of positive squares in 8 ways, for example, as 152881 + 3873024 = 391^2 + 1968^2 .

It is not a de Polignac number, because 4025905 - 25 = 4025873 is a prime.

It is a super-2 number, since 2×40259052 = 32415822138050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4025905.

It is not an unprimeable number, because it can be changed into a prime (4025909) 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 15 ways as a sum of consecutive naturals, for example, 15537 + ... + 15793.

It is an arithmetic number, because the mean of its divisors is an integer number (327789).

It is a Poulet number, since it divides 24025904-1.

Almost surely, 24025905 is an apocalyptic number.

It is an amenable number.

4025905 is a deficient number, since it is larger than the sum of its proper divisors (1218719).

4025905 is a wasteful number, since it uses less digits than its factorization.

4025905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 4025905 is about 2006.4657983629. The cubic root of 4025905 is about 159.0820482882.

The spelling of 4025905 in words is "four million, twenty-five thousand, nine hundred five".

Divisors: 1 5 13 65 241 257 1205 1285 3133 3341 15665 16705 61937 309685 805181 4025905