1287225438 has 16 divisors (see below), whose sum is σ = 2574803856. Its totient is φ = 429016320.

The previous prime is 1287225437. The next prime is 1287225439. The reversal of 1287225438 is 8345227821.

It is an interprime number because it is at equal distance from previous prime (1287225437) and next prime (1287225439).

It is a self number, because there is not a number n which added to its sum of digits gives 1287225438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287225437) 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, 72270 + ... + 88302.

It is an arithmetic number, because the mean of its divisors is an integer number (160925241).

Almost surely, 2^1287225438 is an apocalyptic number.

1287225438 is an abundant number, since it is smaller than the sum of its proper divisors (1287578418).

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

1287225438 is a wasteful number, since it uses less digits than its factorization.

1287225438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29419.

The product of its digits is 215040, while the sum is 42.

The square root of 1287225438 is about 35877.9241038274. The cubic root of 1287225438 is about 1087.8062203321.

The spelling of 1287225438 in words is "one billion, two hundred eighty-seven million, two hundred twenty-five thousand, four hundred thirty-eight".