1225840685 has 16 divisors (see below), whose sum is σ = 1493971776. Its totient is φ = 965478528.

The previous prime is 1225840669. The next prime is 1225840687. The reversal of 1225840685 is 5860485221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1225840685 - 2⁴ = 1225840669 is a prime.

It is a super-3 number, since 3×1225840685³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225840687) 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, 80177 + ... + 94233.

It is an arithmetic number, because the mean of its divisors is an integer number (93373236).

Almost surely, 2^1225840685 is an apocalyptic number.

It is an amenable number.

1225840685 is a deficient number, since it is larger than the sum of its proper divisors (268131091).

1225840685 is a wasteful number, since it uses less digits than its factorization.

1225840685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14332.

The product of its (nonzero) digits is 153600, while the sum is 41.

The square root of 1225840685 is about 35012.0077259217. The cubic root of 1225840685 is about 1070.2321926007.

The spelling of 1225840685 in words is "one billion, two hundred twenty-five million, eight hundred forty thousand, six hundred eighty-five".