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BaseRepresentation
bin11110111001010110101
31220102202111
43313022311
5224344110
633411021
711414422
oct3671265
91812674
101012405
116316a9
12409a71
13295a74
141c4d49
1514ee8a
hexf72b5

1012405 has 4 divisors (see below), whose sum is σ = 1214892. Its totient is φ = 809920.

The previous prime is 1012399. The next prime is 1012411. The reversal of 1012405 is 5042101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5042101 = 37136273.

It is an interprime number because it is at equal distance from previous prime (1012399) and next prime (1012411).

It can be written as a sum of positive squares in 2 ways, for example, as 269361 + 743044 = 519^2 + 862^2 .

It is not a de Polignac number, because 1012405 - 23 = 1012397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 101236 + ... + 101245.

It is an arithmetic number, because the mean of its divisors is an integer number (303723).

21012405 is an apocalyptic number.

It is an amenable number.

1012405 is a deficient number, since it is larger than the sum of its proper divisors (202487).

1012405 is an equidigital number, since it uses as much as digits as its factorization.

1012405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202486.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1012405 is about 1006.1833828880. The cubic root of 1012405 is about 100.4118018645.

Adding to 1012405 its reverse (5042101), we get a palindrome (6054506).

The spelling of 1012405 in words is "one million, twelve thousand, four hundred five".

Divisors: 1 5 202481 1012405