1278236412 has 18 divisors (see below), whose sum is σ = 3231097688. Its totient is φ = 426078792.

The previous prime is 1278236371. The next prime is 1278236413. The reversal of 1278236412 is 2146328721.

It is a happy number.

1278236412 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 2 + 3 + 641 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 35506567 = 1278236412 / (1 + 2 + 7 + 8 + 2 + 3 + 6 + 4 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278236413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17753248 + ... + 17753319.

Almost surely, 2^1278236412 is an apocalyptic number.

1278236412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1278236412 is an abundant number, since it is smaller than the sum of its proper divisors (1952861276).

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

1278236412 is a wasteful number, since it uses less digits than its factorization.

1278236412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35506577 (or 35506572 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1278236412 is about 35752.4322529251. The cubic root of 1278236412 is about 1085.2681597018.

It can be divided in two parts, 12782 and 36412, that added together give a palindrome (49194).

The spelling of 1278236412 in words is "one billion, two hundred seventy-eight million, two hundred thirty-six thousand, four hundred twelve".