125205405 has 16 divisors (see below), whose sum is σ = 215738880. Its totient is φ = 61639488.

The previous prime is 125205403. The next prime is 125205407. The reversal of 125205405 is 504502521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (125205403) and next prime (125205407).

It is not a de Polignac number, because 125205405 - 2¹ = 125205403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125205401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320845 + ... + 321234.

It is an arithmetic number, because the mean of its divisors is an integer number (13483680).

Almost surely, 2^125205405 is an apocalyptic number.

125205405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125205405 is a deficient number, since it is larger than the sum of its proper divisors (90533475).

125205405 is a wasteful number, since it uses less digits than its factorization.

125205405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642100.

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

The square root of 125205405 is about 11189.5221077578. The cubic root of 125205405 is about 500.2737234569.

Adding to 125205405 its reverse (504502521), we get a palindrome (629707926).

The spelling of 125205405 in words is "one hundred twenty-five million, two hundred five thousand, four hundred five".