1226812540 has 24 divisors (see below), whose sum is σ = 2587566240. Its totient is φ = 488580288.

The previous prime is 1226812487. The next prime is 1226812591. The reversal of 1226812540 is 452186221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129352 + ... + 138511.

It is an arithmetic number, because the mean of its divisors is an integer number (107815260).

Almost surely, 2^1226812540 is an apocalyptic number.

1226812540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226812540 is an abundant number, since it is smaller than the sum of its proper divisors (1360753700).

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

1226812540 is a wasteful number, since it uses less digits than its factorization.

1226812540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268101 (or 268099 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1226812540 is about 35025.8838575131. The cubic root of 1226812540 is about 1070.5149470598.

Adding to 1226812540 its reverse (452186221), we get a palindrome (1678998761).

The spelling of 1226812540 in words is "one billion, two hundred twenty-six million, eight hundred twelve thousand, five hundred forty".