1225808090 has 32 divisors (see below), whose sum is σ = 2380338576. Its totient is φ = 451814400.

The previous prime is 1225808083. The next prime is 1225808093. The reversal of 1225808090 is 908085221.

It can be written as a sum of positive squares in 8 ways, for example, as 787868761 + 437939329 = 28069^2 + 20927^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1225808090.

It is not an unprimeable number, because it can be changed into a prime (1225808093) 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, 69140 + ... + 85040.

Almost surely, 2^1225808090 is an apocalyptic number.

1225808090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225808090 is a deficient number, since it is larger than the sum of its proper divisors (1154530486).

1225808090 is a wasteful number, since it uses less digits than its factorization.

1225808090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16514.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1225808090 is about 35011.5422396672. The cubic root of 1225808090 is about 1070.2227067221. Note that the first 3 decimals are identical.

The spelling of 1225808090 in words is "one billion, two hundred twenty-five million, eight hundred eight thousand, ninety".