1205125290 has 40 divisors (see below), whose sum is σ = 3240450180. Its totient is φ = 321366528.

The previous prime is 1205125231. The next prime is 1205125297. The reversal of 1205125290 is 925215021.

1205125290 is a `hidden beast` number, since 12 + 0 + 512 + 52 + 90 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1008761121 + 196364169 = 31761^2 + 14013^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1205125297) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 743095 + ... + 744714.

Almost surely, 2^1205125290 is an apocalyptic number.

1205125290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1205125290 is an abundant number, since it is smaller than the sum of its proper divisors (2035324890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1205125290 is a wasteful number, since it uses less digits than its factorization.

1205125290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487828 (or 1487819 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1205125290 is about 34714.9145181145. The cubic root of 1205125290 is about 1064.1693185279.

The spelling of 1205125290 in words is "one billion, two hundred five million, one hundred twenty-five thousand, two hundred ninety".