1205226405 has 32 divisors (see below), whose sum is σ = 2188224000. Its totient is φ = 629107776.

The previous prime is 1205226391. The next prime is 1205226409. The reversal of 1205226405 is 5046225021.

1205226405 is a `hidden beast` number, since 12 + 0 + 5 + 2 + 2 + 640 + 5 = 666.

It is not a de Polignac number, because 1205226405 - 2⁸ = 1205226149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205226409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88630 + ... + 101319.

It is an arithmetic number, because the mean of its divisors is an integer number (68382000).

Almost surely, 2^1205226405 is an apocalyptic number.

1205226405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205226405 is a deficient number, since it is larger than the sum of its proper divisors (982997595).

1205226405 is a wasteful number, since it uses less digits than its factorization.

1205226405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190010 (or 190004 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1205226405 is about 34716.3708500759. The cubic root of 1205226405 is about 1064.1990804324.

The spelling of 1205226405 in words is "one billion, two hundred five million, two hundred twenty-six thousand, four hundred five".