1225626399 has 12 divisors (see below), whose sum is σ = 1773875376. Its totient is φ = 815456832.

The previous prime is 1225626397. The next prime is 1225626403. The reversal of 1225626399 is 9936265221.

1225626399 is a `hidden beast` number, since 1 + 2 + 2 + 5 + 6 + 2 + 639 + 9 = 666.

It is not a de Polignac number, because 1225626399 - 2¹ = 1225626397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225626397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130842 + ... + 139895.

It is an arithmetic number, because the mean of its divisors is an integer number (147822948).

Almost surely, 2^1225626399 is an apocalyptic number.

1225626399 is a deficient number, since it is larger than the sum of its proper divisors (548248977).

1225626399 is a wasteful number, since it uses less digits than its factorization.

1225626399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271246 (or 271243 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 1225626399 is about 35008.9474134827. The cubic root of 1225626399 is about 1070.1698274709.

The spelling of 1225626399 in words is "one billion, two hundred twenty-five million, six hundred twenty-six thousand, three hundred ninety-nine".