1212413643 has 32 divisors (see below), whose sum is σ = 2123558400. Its totient is φ = 668914848.

The previous prime is 1212413641. The next prime is 1212413659. The reversal of 1212413643 is 3463142121.

It is a happy number.

1212413643 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 4 + 13 + 643 = 666.

It is not a de Polignac number, because 1212413643 - 2¹ = 1212413641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1212413641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105121 + ... + 116082.

It is an arithmetic number, because the mean of its divisors is an integer number (66361200).

Almost surely, 2^1212413643 is an apocalyptic number.

1212413643 is a deficient number, since it is larger than the sum of its proper divisors (911144757).

1212413643 is a wasteful number, since it uses less digits than its factorization.

1212413643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221248 (or 221242 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 1212413643 is about 34819.7306566263. The cubic root of 1212413643 is about 1066.3103015382.

Adding to 1212413643 its reverse (3463142121), we get a palindrome (4675555764).

The spelling of 1212413643 in words is "one billion, two hundred twelve million, four hundred thirteen thousand, six hundred forty-three".