1267291988 has 12 divisors (see below), whose sum is σ = 2238108180. Its totient is φ = 627832512.

The previous prime is 1267291981. The next prime is 1267291999. The reversal of 1267291988 is 8891927621.

It can be written as a sum of positive squares in 2 ways, for example, as 363207364 + 904084624 = 19058^2 + 30068^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1267291981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1452881 + ... + 1453752.

It is an arithmetic number, because the mean of its divisors is an integer number (186509015).

Almost surely, 2^1267291988 is an apocalyptic number.

It is an amenable number.

1267291988 is a deficient number, since it is larger than the sum of its proper divisors (970816192).

1267291988 is a wasteful number, since it uses less digits than its factorization.

1267291988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906746 (or 2906744 counting only the distinct ones).

The product of its digits is 870912, while the sum is 53.

The square root of 1267291988 is about 35599.0447624652. The cubic root of 1267291988 is about 1082.1618755968.

The spelling of 1267291988 in words is "one billion, two hundred sixty-seven million, two hundred ninety-one thousand, nine hundred eighty-eight".