1255020405 has 16 divisors (see below), whose sum is σ = 2040952704. Its totient is φ = 658370880.

The previous prime is 1255020401. The next prime is 1255020419. The reversal of 1255020405 is 5040205521.

It is a happy number.

It is not a de Polignac number, because 1255020405 - 2² = 1255020401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255020401) 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 15 ways as a sum of consecutive naturals, for example, 684889 + ... + 686718.

It is an arithmetic number, because the mean of its divisors is an integer number (127559544).

Almost surely, 2^1255020405 is an apocalyptic number.

1255020405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1255020405 is a deficient number, since it is larger than the sum of its proper divisors (785932299).

1255020405 is a wasteful number, since it uses less digits than its factorization.

1255020405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371676.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 1255020405 is about 35426.2671615286. The cubic root of 1255020405 is about 1078.6575698888.

Adding to 1255020405 its reverse (5040205521), we get a palindrome (6295225926).

The spelling of 1255020405 in words is "one billion, two hundred fifty-five million, twenty thousand, four hundred five".