1225888636 has 24 divisors (see below), whose sum is σ = 2473480800. Its totient is φ = 520730112.

The previous prime is 1225888603. The next prime is 1225888637. The reversal of 1225888636 is 6368885221.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1225888636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225888637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190561 + ... + 196888.

It is an arithmetic number, because the mean of its divisors is an integer number (103061700).

Almost surely, 2^1225888636 is an apocalyptic number.

It is an amenable number.

1225888636 is an abundant number, since it is smaller than the sum of its proper divisors (1247592164).

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

1225888636 is a wasteful number, since it uses less digits than its factorization.

1225888636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387573 (or 387571 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 1225888636 is about 35012.6924985783. The cubic root of 1225888636 is about 1070.2461471151.

The spelling of 1225888636 in words is "one billion, two hundred twenty-five million, eight hundred eighty-eight thousand, six hundred thirty-six".