1225085290 has 32 divisors (see below), whose sum is σ = 2590672896. Its totient is φ = 411216960.

The previous prime is 1225085261. The next prime is 1225085293. The reversal of 1225085290 is 925805221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1225085293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426922 + ... + 429781.

It is an arithmetic number, because the mean of its divisors is an integer number (80958528).

Almost surely, 2^1225085290 is an apocalyptic number.

1225085290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225085290 is an abundant number, since it is smaller than the sum of its proper divisors (1365587606).

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

1225085290 is a wasteful number, since it uses less digits than its factorization.

1225085290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856734.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 1225085290 is about 35001.2184073640. The cubic root of 1225085290 is about 1070.0123124329.

The spelling of 1225085290 in words is "one billion, two hundred twenty-five million, eighty-five thousand, two hundred ninety".