1247277312 has 144 divisors (see below), whose sum is σ = 3808053760. Its totient is φ = 402278400.

The previous prime is 1247277257. The next prime is 1247277319. The reversal of 1247277312 is 2137727421.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1247277319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211362 + ... + 217182.

Almost surely, 2^1247277312 is an apocalyptic number.

1247277312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1247277312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1904026880).

1247277312 is an abundant number, since it is smaller than the sum of its proper divisors (2560776448).

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

1247277312 is an equidigital number, since it uses as much as digits as its factorization.

1247277312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5877 (or 5857 counting only the distinct ones).

The product of its digits is 32928, while the sum is 36.

The square root of 1247277312 is about 35316.8134462893. The cubic root of 1247277312 is about 1076.4346626770.

The spelling of 1247277312 in words is "one billion, two hundred forty-seven million, two hundred seventy-seven thousand, three hundred twelve".