1266399992 has 32 divisors (see below), whose sum is σ = 2789624880. Its totient is φ = 531356160.

The previous prime is 1266399991. The next prime is 1266399997. The reversal of 1266399992 is 2999936621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266399991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552353 + ... + 554640.

Almost surely, 2^1266399992 is an apocalyptic number.

It is an amenable number.

1266399992 is an abundant number, since it is smaller than the sum of its proper divisors (1523224888).

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

1266399992 is a wasteful number, since it uses less digits than its factorization.

1266399992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107023 (or 1107019 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 56.

The square root of 1266399992 is about 35586.5141872592. The cubic root of 1266399992 is about 1081.9079192244.

It can be divided in two parts, 126639 and 9992, that added together give a palindrome (136631).

The spelling of 1266399992 in words is "one billion, two hundred sixty-six million, three hundred ninety-nine thousand, nine hundred ninety-two".