1225805757 has 16 divisors (see below), whose sum is σ = 1887872832. Its totient is φ = 699211520.

The previous prime is 1225805747. The next prime is 1225805761. The reversal of 1225805757 is 7575085221.

It is a cyclic number.

It is not a de Polignac number, because 1225805757 - 2²⁰ = 1224757181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225805747) 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, 1091958 + ... + 1093079.

It is an arithmetic number, because the mean of its divisors is an integer number (117992052).

Almost surely, 2^1225805757 is an apocalyptic number.

1225805757 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1225805757 is a deficient number, since it is larger than the sum of its proper divisors (662067075).

1225805757 is a wasteful number, since it uses less digits than its factorization.

1225805757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185068.

The product of its (nonzero) digits is 196000, while the sum is 42.

The square root of 1225805757 is about 35011.5089220673. The cubic root of 1225805757 is about 1070.2220277602. Note that the first 3 decimals are identical.

The spelling of 1225805757 in words is "one billion, two hundred twenty-five million, eight hundred five thousand, seven hundred fifty-seven".