1243214855 has 16 divisors (see below), whose sum is σ = 1549461504. Its totient is φ = 956564640.

The previous prime is 1243214851. The next prime is 1243214867. The reversal of 1243214855 is 5584123421.

It is not a de Polignac number, because 1243214855 - 2² = 1243214851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243214851) 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, 662 + ... + 49868.

It is an arithmetic number, because the mean of its divisors is an integer number (96841344).

Almost surely, 2^1243214855 is an apocalyptic number.

1243214855 is a deficient number, since it is larger than the sum of its proper divisors (306246649).

1243214855 is a wasteful number, since it uses less digits than its factorization.

1243214855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49406.

The product of its digits is 38400, while the sum is 35.

The square root of 1243214855 is about 35259.2520482213. The cubic root of 1243214855 is about 1075.2647208171.

The spelling of 1243214855 in words is "one billion, two hundred forty-three million, two hundred fourteen thousand, eight hundred fifty-five".