1266376400 has 30 divisors (see below), whose sum is σ = 3042470262. Its totient is φ = 506550400.

The previous prime is 1266376373. The next prime is 1266376453. The reversal of 1266376400 is 46736621.

It can be written as a sum of positive squares in 3 ways, for example, as 14348944 + 1252027456 = 3788^2 + 35384^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1582571 + ... + 1583370.

Almost surely, 2^1266376400 is an apocalyptic number.

1266376400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266376400 is an abundant number, since it is smaller than the sum of its proper divisors (1776093862).

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

1266376400 is a wasteful number, since it uses less digits than its factorization.

1266376400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165959 (or 3165948 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 1266376400 is about 35586.1827118335. The cubic root of 1266376400 is about 1081.9012008284.

The spelling of 1266376400 in words is "one billion, two hundred sixty-six million, three hundred seventy-six thousand, four hundred".